| 新疆准噶尔盆地中、晚侏罗世多重地层研究 |
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| 关键词:biostratigraphy isotope age dating chronostratigraphy cyclostratigraphy magnetostratigraphy terrestrial Jurassic/Cretaceous boundary Xinjiang Junggar Basin |
| 基金项目:中国地质调查局地质调查项目“全国陆相地层划分对比及海相地层阶完善”(编号: 1212011120142)之课题“陆相侏罗系——古近系界线地层研究” |
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| Comprehensive Study of the Middle–Upper Jurassic Strata in the Junggar Basin, Xinjiang |
| This paper presents the results of a comprehensive study of lithostratigraphy, biostratigraphy, chronostratigraphy, cyclostratigraphy and magnetostratigraphy of the Middle–Upper Jurassic strata in the Junggar Basin, Xinjiang. The main findings are as follows: the Toutunhe Formation consists of the uppermost part of the Bathonian, Callovian and the Lower–Middle Oxfordian; the ages of the base and top of this formation are 166.2 Ma and 160.8 Ma respectively, and its sedimentary interval is about 5.4 Ma. The age of the top of the Qigu Formation is estimated at around 155.3 Ma, and the sedimentary interval of this formation is about 5.5 Ma, suggesting the upper Oxfordian and middle Kimmeridgian. The top horizon of the Qigu Formation is almost coeval to that of the Tiaojishan Formation in northern Hebei and western Liaoning provinces. This means that the Qigu Formation is lower than the Tuchengzi Formation in northern Hebei and western Liaoning. The Kalaza Formation is assigned to the late Kimmeridgian, and the overlying Tugulu Group is early Cretaceous in age, which indicates an obvious unconformity with the existence of a stratigraphic gap from the Tithonian to the possible lowermost part of the Cretaceous, and the missing strata are equal to over 7 Ma between the Jurassic and the Cretaceous in the study area. The strata through the Jurassic/Cretaceous boundary are absent. |
| DENG Sheng-hui,WANG Si-en,YANG Zhen-yu,LU Yuan-zheng,LI Xin,HU Qing-yue,AN Chun-zhi,XI Dang-peng,WAN Xiao-qiao.2015.Comprehensive Study of the Middle–Upper Jurassic Strata in the Junggar Basin, Xinjiang[J].Acta Geoscientica Sinica,36(5):559-574. |
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