Paleozoic sedimentary basins and volcanic arc systems of southern Mongolia: New geochemical and petrographic constraints

Memoir of the Geological Society of America

Volumn 194, Issue , 2001, Pages 117-149

  Lamb, Melissa A ^a,c   Badarch, Gombosuren ^b  

^a STANFORD UNIVERSITY   (United States)

^b INSTITUTE OF CHEMISTRY AND CHEMICAL TECHNOLOGY   (Mongolia)

^c UNIVERSITY OF ST THOMAS   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ANALYTICAL GEOCHEMISTRY; OCEANOGRAPHY; SANDSTONE; STRATIGRAPHY; TECTONICS; TRACE ELEMENTS; VOLCANOES;

CARBONIFEROUS ROCKS; GEOCHEMICAL ANALYSIS; MAJOR AND TRACE ELEMENTS; PALEOGEOGRAPHIC RECONSTRUCTION; PALEOZOIC STRATA; SEDIMENTARY BASIN; STRATIGRAPHIC DATA; VOLCANIC ACTIVITIES;

VOLCANIC ROCKS;

DEVONIAN; GEOCHEMICAL SURVEY; LITHOSTRATIGRAPHY; ORDOVICIAN; PALEOZOIC; PETROGRAPHY; SEDIMENTARY BASIN; VOLCANIC ARC;

MONGOLIA;

EID: 84871187575     PISSN: 00721069     EISSN: None     Source Type: Book Series    
DOI: 10.1130/0-8137-1194-0.117     Document Type: Article

References (96)

1. Amory, J.Y., 1996, Permian sedimentation and tectonics of southern Mongolia [M.S. thesis]: Stanford, California, Stanford University, 183
2. Arculus, R.J., 1976, Geology and geochemistry of the alkali basalt-andesite association of Grenada, Lesser Antilles island arc: Geological Society of America Bulletin, v. 87, p. 612-624.
3. Baljinnyam, I., Bayasgalan, A., Borisov, B.A., Cisternas, A., Dem'yanovich, M.G., Ganbaatar, L., Kochetkov, V.M., Kurushin, R.A., Molnar, P., Philip, H., and Vashchilov, Y.Y., 1993, Ruptures of major earthquakes and active deformation in Mongolia and its surroundings: Geological Society of America Memoir 181, 62
4. Bibikova, Y.V., Kirnozova, T.I., Kozakov, I.K., Kotov, A.B., Neymark, L.A., Gorokhovskiy, B.M., and Shuleshko, I.K., 1992, U-Pb ages for polymetamorphic complexes on the southern flank of the Mongolian and Gobi Altai: Geotectonics, v. 26, p. 166-172.
5. Busby, C.J., and Ingersoll, R.V., 1995, Tectonics of sedimentary basins: Cambridge, Massachusetts, Blackwell Science, 579
6. Carroll, A.R., Liang Yunhai, Graham, S.A., Xiao Xuchang, Hendrix, M.S., Chu Jinchi, and McKnight, C. L., 1990, Junggar Basin, northwest China; trapped late Paleozoic ocean: Tectonophysics, v. 181, p. 1-14.
7. Carroll, A.R., Graham, S.A., Hendrix, M.S., Ying Xudong, and Zhou Da, 1995, Late Paleozoic tectonic amalgamation of northwestern China; sedimentary record of the northern Tarim, northwestern Turpan, and southern Junggar basins: Geological Society of America Bulletin, v. 107, p. 571-594.
8. Chang, E.Z., Coleman, R.G., and Ying Xudong, 1996, 1:2,000,000 geodynamic map of Asia (western part): Tulsa, Oklahoma, American Association of Petroleum Geologists, scale 1:2 000 000.
9. Coleman, R.G., 1989, Continental growth of northwest China: Tectonics, v. 8, p. 621-635.
10. Cunningham, W.D., Windley, B.F., Dorjnamjaa, D., Badamgarov, J., and Saandar, M., 1996, Late Cenozoic transpression in southwestern Mongolia and the Gobi Altai-Tien Shan connection: Earth and Planetary Science Letters, v. 140, p. 67-81.
11. Cunningham, W.D., Windley, B.F., Owen, L.A., Barry, T., Dorjnamjaa, D., and Badamgarav, J., 1997, Geometry and style of partitioned deformation within a late Cenozoic transpressional zone in the eastern Gobi Altai Mountains, Mongolia: Tectonophysics, v. 277, p. 285-306.
12. DeLong, S.E., Hodges, F.N., and Arculus, R.J., 1975, Ultramafic and mafic inclusions, Kanaga Island, Alaska, and the occurrence of alkaline rocks in island arcs: Journal of Geology, v. 83, p. 721-736.
13. Dickinson, W.R., 1970, Interpreting detrital modes of graywacke and arkose: Journal of Sedimentary Petrology, v. 40, p. 695-707.
14. Dickinson, W.R., 1985, Interpreting provenance relations from detrital modes of sandstones, in Zuffa, G.G., ed., Provenance of arenites: NATO Advanced Study Institutes Series C; Mathematical and Physical Sciences, v. 148, p. 333-361.
15. Dobretsov,N.L., Coleman, R.G., and Berzin, N.A., 1994, Geodynamic evolution of the Paleoasian Ocean: Russian Geology and Geophysics, v. 35, p. 233.
16. Dobretsov, N.L., Sobolev, N.V., Shatsky, V.S., Coleman, R.G., and Ernst, W.G., 1995, Geotectonic evolution of diamondiferous paragneisses, Kokchetav Complex, northern Kazakhstan; the geologic enigma of ultrahigh- pressure crustal rocks within a Paleozoic foldbelt: The Island Arc, v. 4, p. 267-279.
17. Dorjnamjaa, D., Badarch, G., and Orolmaa, D., 1993, The geodynamic evolution of the mobile fold belts of the territory of Mongolia, in Coleman, R.G., ed., Reconstruction of the paleo-Asian ocean: The Netherlands, VSP International Science Publishers, p. 63-76.
18. Eenzhin, G., 1983, The southern Mongolian Hercynian eugeosynclinal zone (Dzolen Range - Mandal-Ovoo) during Early Devonian time: Geotectonics, v. 17, p. 326-334.
19. Enkin, R.J., Yang Zhenyu, Chen Yan, and Courtillot, V., 1992, Paleomagnetic constraints on the geodynamic history of the major blocks of China from the Permian to the present: Journal of Geophysical Research, v. 97, p. 13953-13989.
20. Fournelle, J.H., Marsh, B.D., and Myers, J.D., 1994, Age, character, and significance of Aleutian arc volcanism, in Plafker, G., and Berg, H.C., eds., The geology of Alaska: Boulder, Colorado, Geological Society of America, Geology of North America, v. G-1, p. 723-757.
21. Fryer, P., Taylor, B., Langmuir, C.H., Hochstaedter, A.G., 1990, Petrology and geochemistry of lavas from the Sumisu andTorishima backarc rifts: Mariana Trough: Earth and Planetary Science Letters, v. 100, p. 161-178.
22. Gansu Province Bureau of Geology and Mineral Resources, 1989, Regional geology of Gansu province: Beijing, Geological Publishing House, Geological Memoirs, Series 1, no. 19 scale 1: 1 000 000, 690
23. Golonka, J., Ross, M.I., and Scotese, C.R., 1994, Phanerozoic paleogeographic and paleoclimatic modeling maps, in Embry, A.F., et al., eds., Pangea; global environments and resources: Canadian Society of Petroleum Geologists Memoir 17, p. 1-47.
24. Graham, S.A., Hendrix, M.S.,Wang, L.B., and Carroll, A.R., 1993, Collisional successor basins of western China; impact of tectonic inheritance on sand composition: Geological Society ofAmerica Bulletin, v. 105, p. 323-344.
25. Graham, S.A., Hendrix, M.S., Badarch, G., and Badamgarav, D., 1996, Sedimentary record of transition from contractile to extensional tectonism, Mesozoic, southern Mongolia: Geological Society of America Abstracts with Programs, v. 28, no. 7, p. A-68.
26. Hall, A., 1987, Igneous petrology: New York, Longman Scientific and Technical, 573
27. Hellman, P.L., Smith, R.E., and Henderson, P., 1977, Rare earth element investigation of the Cliefden Outcrop, N.S.W., Australia: Contributions to Mineralogy and Petrology, v. 65, p. 155-164.
28. Hendrix, M.S., 2000, Evolution of Mesozoic sandstone compositions, southern Junggar, northern Tarim and western Turpan basins, northwest China: A detrital record of the ancestral Tian Shan: Journal of Sedimentary Research (in press).
29. Hendrix, M.S., Graham, S.A., Amory, J.Y., and Badarch, G., 1996, Noyon Uul syncline, southern Mongolia; lower Mesozoic sedimentary record of the tectonic amalgamation of Central Asia: Geological Society of America Bulletin, v. 108, p. 1256-1274.
30. Hochstaedter, A.G., Gill, J.B., Kusakabe, M., Newman, S., Pringle, M., Taylor, B., and Fryer, P., 1990, Volcanism in the Sumisu Rift; I, Major element, volatile, and stable isotope geochemistry: Mariana Trough: Earth and Planetary Science Letters, v. 100, p. 179-194.
31. Ingersoll, R.V., Bullard, T.F., Ford, R.L., Grimm, J.P., Pickle, J.D., and Sares, S.W., 1984, The effect of grain size on detrital modes; a test of the Gazzi- Dickinson point-counting method: Journal of Sedimentary Petrology, v. 54, p. 103-116.
32. Johnson, C.L., Graham, S.A., Webb, L.E., Badarch, G., Beck, M., Hendrix, M.S., Lenegen, R., and Sjostrom, D., 1997, Sedimentary response to late Mesozoic extension, southern Mongolia: Eos (Transactions, American Geophysical Union), v. 78, p. F175.
33. Katili, J.A., 1991, Tectonic evolution of eastern Indonesia and its bearing on the occurrence of hydrocarbons: Marine and Petroleum Geology, v. 8, p. 70-83.
34. Lamb, M.A., 1998, Paleozoic sedimentation, volcanism and tectonics in southern Mongolia [Ph.D. thesis]: Stanford, California, Stanford University, 207
35. Lamb,M.A., and Badarch, G., 1997, Paleozoic sedimentary basins and volcanicarc systems of southern Mongolia: New stratigraphic and sedimentologic constraints: International Geology Review, v. 39, p. 542-576.
36. Lamb, M.A., and Cox, D., 1998, New 40Ar/39Ar age data and implications for porphyry copper deposits of Mongolia: Economic Geology, v. 93, p. 524-529.
37. Lamb, M.A., Hanson, A.D., Graham, S.A., Webb, L., and Badarch, G., 1999, Left-lateral sense offset of Upper Proterozoic to Paleozoic features across the Gobi Onon, Tost, and Zuunbayan faults in southern Mongolia and implications for other central Asian faults: Earth and Planetary Science Letters, v. 173, p. 183-194.
38. Le Maitre, R.W., 1976, The chemical variability of some common igneous rocks: Journal of Petrology, v. 17, p. 589-637.
39. Le Maitre, R.W., Bateman, P., Dudek, A., Keller, J., Lemeyre, J., Le Bas, M. J., Sabine, P.A., Schmid, R., Sorensen, H., Streckeisen, A., Wooley, A.R., and Zanettin, B., 1989, Aclassification of igneous rocks and glossary of terms: Oxford, Blackwell Scientific Publications, 193
40. Lowe, T.K., 1995, Petrogenesis of the Minarets and Merced Peak volcanicplutonic complexes, Sierra Nevada, California [Ph.D. thesis]: Stanford, California, Stanford University, 157
41. Marsaglia, K.M., and Ingersoll, R.V., 1992, Compositional trends in arc-related, deep-marine sand and sandstone; a reassessment of magmatic-arc provenance: Geological Society of America Bulletin, v. 104, p. 1637-1649.
42. Marsaglia, K.M., Ingersoll, R.V., and Packer, B.M., 1992, Tectonic evolution of the Japanese Islands as reflected in modal compositions of Cenozoic forearc and backarc sand and sandstone: Tectonics, v. 11, p. 1028-1044.
43. McBirney, A.R., 1993, Igneous petrology: Boston, Jones and Bartlett Publishers, Inc., 508
44. Meschede, M., 1986, A method of discrimination between different types of mid-ocean ridge basalts and continental tholeiites with the Nb-Zr-Y diagram: Chemical Geology, v. 56, p. 207-218.
45. Mitchell, A.H.G., 1970, Facies of an early Miocene volcanic arc, Malekula island, New Hebrides: Sedimentology, v. 14, p. 210-243.
46. Mossakovsky, A.A., Ruzhentsev, S.V., Samygin, S.G., and Kheraskova, T.N., 1993, Central Asian fold belt: Geodynamic evolution and formation history: Geotectonics, v. 27, p. 445-474.
47. Mueller, J.F., Rogers, J.J.W., Jin Yugan, Wang Huayu, Li Wenguo, Chronic, J., and Mueller, J.F., 1991, Late Carboniferous to Permian sedimentation in Inner Mongolia, China, and tectonic relationships between north China and Siberia: Journal of Geology, v. 99, p. 251-263.
48. Mullen, E.D., 1983, MnO/TiO2/P2O5; a minor element discriminant for basaltic rocks of oceanic environments and its implications for petrogenesis: Earth and Planetary Science Letters, v. 62, p. 53-62.
49. Natal'in, B.A., Sengör, A.M.C., and Itü, M.F., 1996, Arc-slicing and arcshaving strike-slip faults in the Paleozoic collage of the Altaids, Central Asia: Geological Society of America Abstracts with Programs, v. 28, no. 7, p. A67-68.
50. Nie Shangyou, Rowley, D.B., and Ziegler, A.M., 1990, Constraints on the location of the Asian microcontinents in Palaeo-Tethys during the late Palaeozoic, in McKerrow, W.S., and Scotese, C.R., eds., Palaeozoic palaeogeography and biogeography: Geological Society [London] Memoir 12, p. 397-409.
51. Nei Mongol Autonomous Region Bureau of Geology and Mineral Resources, 1991, Regional geology of Nei Mongol (Inner Mongolia) Autonomous Region: Beijing, Geological Publishing House, Geological Memoirs, Series 1, no. 25 scale 1:2 000 000, 725
52. Norrish, K., and Chappell, B.W., 1977, X-ray fluorescence spectrometry, in Zussman, J., ed., Physical methods in determinative mineralogy: London, Academic Press, p. 210-272.
53. Norrish, K., and Hutton, J.T., 1969, An accurate X-ray spectographic method for the analysis of a wide range of geological samples: Geochimica et Cosmochimica Acta, v. 33, p. 431-453.
54. Packham, G., 1996, Cenozoic SE Asia; reconstructing its aggregation and reorganization, in Hall, R., and Blundell, D.J., eds., Tectonic evolution of Southeast Asia: Geological Society [London] Special Publication 106, p. 123-152.
55. Pearce, J.A., 1982, Trace element characteristics of lavas from destructive plate boundaries, in Thorpe, R.S., ed., Andesites; orogenic andesites and related rocks: Chichester, U.K., John Wiley & Sons, p. 525-548.
56. Pearce, J.A., 1983, Role of the sub-continental lithosphere in magma genesis at active continental margins in Hawkesworth, C.J., and Norry, M.J., ed.,Continental basalts and mantle xenoliths: Nantwich, U.K., Shiva Publications, p. 230-249.
57. Pearce, J.A., and Gale, G.H., 1977, Identification of ore-deposition environment from trace-element geochemistry of associated igneous host rocks, in Volcanic processes in ore genesis: London, Institution of Mining and Metallurgy, p. 14-24.
58. Pruner, P., 1992, Palaeomagnetism and palaeogeography of Mongolia from the Carboniferous to the Cretaceous; final report: Physics of the Earth and Planetary Interiors, v. 70, p. 169-177.
59. Pubellier, M., Quebral, R., Aurelio, M., and Rangin, C., 1996, Docking and postdocking escape tectonics in the southern Philippines in Hall, R., and Blundell, D.J., eds., Tectonic evolution of Southeast Asia: Geological Society [London] Special Publication 106, p. 511-523.
60. Rangin, C., Dahrin, D., Quebral, R., and Party, M.S., 1996, Collision and strikeslip faulting in the northern Molucca Sea (Philippines and Indonesia); preliminary results of a morphotectonic study, in Hall, R., and Blundell, D.J., eds., Tectonic evolution of Southeast Asia: Geological Society [London] Special Publication 106, p. 29-46.
61. Reynolds, R.C., Jr., 1967, Estimation of mass absorption coefficients by Compton scattering: Improvements and extensions of the method: American Mineralogist, v. 52, p. 1493-1502.
62. Rollinson, H.R., 1993, Using geochemical data; evaluation, presentation, interpretation: Harlow, U.K., Longman Scientific & Technical, 352
63. Rumelhart, P.E., and Ingersoll, R.V., 1997, Provenance of the Upper Miocene Modelo Formation and subsidence analysis of the Los Angeles Basin, southern California: Implications for paleotectonic and paleogeogrpahic reconstructions: Geological Society of America Bulletin, v. 109, p. 885-899.
64. Ruzhentsev, S.V., and Pospelov, I.I., 1992, The south Mongolian Variscan fold system: Geotectonics, v. 26, p. 383-395.
65. Ruzhentsev, S.V., Badarch, H., and Voznesenskaya, T.A., 1985, Tectonics of the Trans-Altai Zone of Mongolia (the Gurvansaykhan and Dzolen ranges): Geotectonics, v. 19, p. 276-284.
66. Ruzhentsev, S.V., Pospelov, I.I., and Badarch, G., 1989, Tectonics of the Mongolian Indosinides: Geotectonics, v. 23, p. 476-487.
67. Ruzhentsev, S.V., Pospelov, I.I., and Badarch, G., 1992, Tectonics of the Barunkhurai Depression of Mongolia: Geotectonics, v. 26, p. 67-77.
68. Scotese, C.R., and McKerrow, W.S., 1990, Revised world maps and introduction, in McKerrow, W.S., and Scotese, C.R., eds., Palaeozoic palaeogeography and biogeography: Geological Society [London] Memoir 12, p. 1-21.
69. Şengör, A.M.C., and Natal'in, B.A., 1996, Paleotectonics of Asia: Fragments of a synthesis, in Yin, A., and Harrison, M., eds., Tectonic development of Asia: Cambridge, Cambridge University Press, p. 486-641.
70. Şengör, A.M.C., Burke, K., and Natal'in, B.A., 1993a, Asia: A continent built and assembled over the past 500 million years: Geological Society of America Short Course Notes, 262
71. Şengör, A.M.C., Natal'in, B.A., and Burtman, V.S., 1993b, Evolution of the Altaid tectonic collage and Palaeozoic crustal growth in Eurasia: Nature (London), v. 364, p. 299-307.
72. Shervais, J.W., 1982, Ti-V plots and the petrogenesis of modern and ophiolitic lavas: Earth and Planetary Science Letters, v. 59, p. 101-118.
73. Thirlwall, M.F., and Graham, A.M., 1984, Evolution of high-Ca, high-Sr Cseries basalts from Grenada, Lesser Antilles; the effects of intra-crustal contamination: Geological Society of London of Journal, v. 141, p. 427-445.
74. Tomurtogoo, O., 1997, A new tectonic scheme of the Paleozoides in Mongolia, in Xu Zhiqin, Ren Yufeng, and Qiu Xiaoping, eds., 30th International Geological Congress Proceedings: The Netherlands, VSP, p. 75-82.
75. Traynor, J.J., and Sladen, C., 1995, Tectonic and stratigraphic evolution of the Mongolian People's Republic and its influence on hydrocarbon geology and potential: Marine and Petroleum Geology, v. 12, p. 35-52.
76. Trop, J.M., and Ridgway, K.D., 1997, Petrofacies and provenance of a Late Cretaceous suture zone thrust-top basin, Cantwell basin, central Alaska Range: Journal of Sedimentary Research, v. 67, p. 469-485.
77. Vallier, T.L., Scholl, D.W., Fisher, M.A., Bruns, T.R., Wilson, F.H., von Huene, R., and Stevenson, A.J., 1994, Geologic framework of the Aleutian Arc, Alaska, in Plafker, G., and Berg, H.C., eds., The geology of Alaska: Boulder, Colorado, Geological Society of America, Geology of North America, v. G-1, p. 367-388.
78. VanderPlas, L., and Tobi, A.C., 1965, Achart for judging the reliability of point counting results: American Journal of Science, v. 263, p. 87-90.
79. Voznesenskaya, T.A., and Badarch, G., 1991, Sedimentation and volcanism in the Dzhinsetsk subzone of the southern Mongolian Variscides: Lithology and Mineral Resources (USSR), v. 26, p. 135-148.
80. Voznesenskaya, T.A., Rateyev, M.A., Kheirov, M.B., Kalashnikova, N.L., and Shabrova, V.P., 1989, Fine-grained tephrogenic and sedimentary rocks from the axial zone of the southern Mongolian Variscides: Lithology and Mineral Resources (USSR), v. 24, p. 114-124.
81. Webb, L.E., Graham, S.A., Johnson, C.L., Badarch, G., Beck, M.,Hendrix, M.S., Lenegen, R., and Sjostrom, D., 1997, Characteristics and implications of the Onch Hayrhan metamorphic core complex of southern Mongolia: Eos (Transactions, American Geophysical Union), v. 78, p. F174-F175.
82. Willis, J.P., 1989, Compton scatter and matrix correction for trace element analysis of geological materials, in Ahmedali, S.T., ed., X-ray fluorescence analysis in the geological sciences; advances in methodology: Geological Society of Canada Short Course 7, p. 91-140.
83. Wilson, M., 1989, Igneous petrogenesis; a global tectonic approach: London, Unwin Hyman, 466
84. Winchester, J.A., and Floyd, P.A., 1977, Geochemical discrimination of different magma series and their differentiation products using immobile elements: Chemical Geology, v. 20, p. 325-343.
85. Windley, B.F., Li Jingyi, Guo Jinhui, and Zhang Chi, 1991, The Devonian Altai orogenic belt, Chinese Central Asia: Terra Abstracts, v. 3, p. 376-377.
86. Windley, B.F., Guo Jinhui, Li Jingyi, and Zhang Chi, 1994, Subdivisions and tectonic evolution of the Chinese Altai: Russian Geology and Geophysics, v. 35, p. 98-99.
87. World Mapping Project 1985, Tectonic map of the World: Houston, Texas, Exxon Production Research Company, scale 1:10 000 000.
88. Xinjiang Uygur Autonomous Region Bureau of Geology and Mineral Resources, 1993, Regional geology of Xinjiang Uygur Autonomous Region: Beijing, Geological Publishing House, Geological Memoirs, Series 1, no. 32, scale 1:1 500 000, 841
89. Yanshin, A.L., ed., 1989, Geologic map of the Mongolian People's Republic: Moscow, Akademia Nauk, scale 1:1 500 000.
90. Zhang, Z. M., Liou, J.G., and Coleman, R.G., 1984, An outline of the plate tectonics of China: Geological Society of America Bulletin, v. 95, p. 295-312.
91. Zhao Xixi, Coe, R.S., Zhou Yaoxiu, Wu Haoruo, and Wang Jie, 1990, New paleomagnetic results from northern China: Collision and suturing with Siberia and Kazakhstan: Tectonophysics, v. 181, p. 43-81.
92. Zheng Yadong, Zhang, Q.,Wang, Y., Liu, R.,Wang, S.G., Zuo Guochao,Wang Shizheng, Lkaasuren, B., Badarch, G., and Badamgarav, Z., 1996, Great Jurassic thrust sheets in Beishan (North Mountains); Gobi areas of China and southern Mongolia: Journal of Structural Geology, v. 18, p. 1111-1126.
93. Zinniker, D.A., 1997, Reconnaissance palynology and evidence of climate change across the Permian/Triassic boundary, Ih Uvgon, southern Mongolia: Geological Society of America Abstracts with Programs, v. 29, no. 6, p. A-97.
94. Zonenshayn, L.P., Kuzmin, M.I., and Natapov, L.M., 1990, Geology of the USSR: A plate-tectonic synthesis: American Geophysical Union, Geodynamics Series, v. 21, 242
95. Zorin, Y.A., Belichenko, V.G., Turutanov, E.K., Kozhenvnikov, V.M., Ruzhentsev, S.V., Dergunov, A.B., Filippova, I.B., Tomurtogoo, O., Arvisbaatar, N., Bayasgalan, T., Biambaa, C., and Khosbayar, P., 1993, The South Siberia-Central Mongolia transect: Tectonophysics, v. 225, p. 361-378.
96. Zorin, Y.A., Belichenko, V.G., Turutanov, E.K., Turutanov, Y.K., Mordinova, V.V., Kozhenikov, V.M., Khozbayar, P., Tomurtogoo, O., Arvisbaatar, N., Gao, S., and Davis, P., 1994, Baikal-Mongolia transect: Russian Geology and Geophysics, v. 35, p. 78-92.