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Depositional ages and characteristics of Middle-Upper Jurassic and Lower Cretaceous lacustrine deposits in southeastern Mongolia
Hasegawa, Hitoshi1,2; Ando, Hisao3; Hasebe, Noriko4; Ichinnorov, Niiden5; Ohta, Tohru6; Hasegawa, Takashi7; Yamamoto, Masanobu8; Li, Gang (李罡)9; Erdenetsogt, Bat-Orshikh10; Heimhofer, Ulrich11; Murata, Takayuki3; Shinya, Hironori6; Enerel, G.12; Oyunjargal, G.12; Munkhtsetseg, O.12; Suzuki, Noriyuki13; Irino, Tomohisa8; Yamamoto, Koshi14
2018-05
Source PublicationISLAND ARC
ISSN1038-4871
Volume27Issue:3Pages:1-17
Abstract

Lower Cretaceous lacustrine oil shales are widely distributed in southeastern Mongolia. Due to the high organic carbon content of oil shale, many geochemical studies and petroleum exploration have been conducted. Although most of the oil shales are considered to be Early Cretaceous in age, a recent study reveals that some were deposited in the Middle Jurassic. The present study aims at establishing depositional ages and characteristics of the Jurassic and Cretaceous lacustrine deposits in Mongolia. The Lower Cretaceous Shinekhudag Formation is about 250 m thick and composed of alternating beds of shale and dolomite. The Middle Jurassic Eedemt Formation is about 150 m thick and composed of alternating beds of shale, dolomitic marl, and siltstone. The alternations of shale and dolomite in both formations were formed by lake level changes, reflecting precipitation changes. Shales were deposited in the center of a deep lake during highstand, while dolomites were formed by primary precipitation during lowstand. Based on the radiometric age dating, the Shinekhudag Formation was deposited between 123.8 +/- 2.0 Ma and 118.5 +/- 0.9 Ma of the early Aptian. The Eedemt Formation was deposited at around 165-158Ma of Callovian-Oxfordian. The calculated sedimentation rate of the Shinekhudag Formation is between 4.7 +/- 2.6 cm/ky and 10.0 +/- 7.6 cm/ky. Shales in the Shinekhudag Formation show micrometer-scale lamination, consisting of algal organic matter and detrital clay mineral couplets. Given the average thickness of micro-laminae and calculated sedimentation rate, the micro-lamination is most likely of varve origin. Both Middle-Upper Jurassic and Lower Cretaceous lacustrine oil shales were deposited in intracontinental basins in the paleo-Asian continent. Tectonic processes and basin evolution basically controlled the deposition of these oil shales. In addition, enhanced precipitation under humid climate during the early Aptian and the Callovian-Oxfordian was another key factor inducing the widespread oil shale deposition in Mongolia.

KeywordCretaceous Humid Climate Jurassic Lake Mongolia Oil Shale U-pb Age Varve
DOI10.1111/iar.12243
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000432002000001
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/22653
Collection中国科学院南京地质古生物研究所
其他
Affiliation1.Kochi Univ, Fac Sci & Technol, Dept Global Environm & Disaster Prevent, Kochi 7808520, Japan;
2.Nagoya Univ, Univ Museum, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, Japan;
3.Ibaraki Univ, Fac Sci, Dept Earth Sci, Bunkyo Ku, Mito, Ibaraki 3108512, Japan;
4.Kanazawa Univ, Inst Nat & Environm Technol, Kanazawa, Ishikawa 9201192, Japan;
5.Mongolian Acad Sci, Inst Paleontol & Geol, POB 260, Ulaanbaatar 210351, Mongol Peo Rep;
6.Waseda Univ, Fac Educ & Integrated Arts & Sci, Dept Earth Sci, Shinjuku Ku, Tokyo 1698050, Japan;
7.Kanazawa Univ, Fac Sci, Dept Earth Sci, Kanazawa, Ishikawa 9201192, Japan;
8.Hokkaido Univ, Fac Environm Earth Sci, Kita Ku, Kita 8,Nishi 5, Sapporo, Hokkaido 0600810, Japan;
9.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China;
10.Natl Univ Mongolia, Dept Geol & Geophys, KH Surguuliin Gudamj 1, Ulaanbaatar 14200, Mongol Peo Rep;
11.Leibniz Univ Hannover, Inst Geol, Welfengarten 1, D-30167 Hannover, Germany;
12.Mongolian Univ Sci & Technol, Sch Geol & Min, Baga Toiruu34, Ulaanbaatar 210646, Mongol Peo Rep;
13.Hokkaido Univ, Dept Nat Hist Sci, Kita Ku, Kita 8,Nishi 5, Sapporo, Hokkaido 0600810, Japan;
14.Nagoya Univ, Grad Sch Environm Studies, Chikusa Ku, Furo Cho, Nagoya, Aichi 4648601, Japan
Recommended Citation
GB/T 7714
Hasegawa, Hitoshi,Ando, Hisao,Hasebe, Noriko,et al. Depositional ages and characteristics of Middle-Upper Jurassic and Lower Cretaceous lacustrine deposits in southeastern Mongolia[J]. ISLAND ARC,2018,27(3):1-17.
APA Hasegawa, Hitoshi.,Ando, Hisao.,Hasebe, Noriko.,Ichinnorov, Niiden.,Ohta, Tohru.,...&Yamamoto, Koshi.(2018).Depositional ages and characteristics of Middle-Upper Jurassic and Lower Cretaceous lacustrine deposits in southeastern Mongolia.ISLAND ARC,27(3),1-17.
MLA Hasegawa, Hitoshi,et al."Depositional ages and characteristics of Middle-Upper Jurassic and Lower Cretaceous lacustrine deposits in southeastern Mongolia".ISLAND ARC 27.3(2018):1-17.
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