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DOI | 10.1007/s11430-020-9689-3 |
New insights on the age of the Mengyejing Formation in the Simao Basin, SE Tethyan domain and its geological implications | |
Yan, Maodu; Zhang, Dawen; Fang, Xiaomin; Zhang, Weilin; Song, Chunhui; Liu, Chenglin; Zan, Jinbo; Shen, Miaomiao | |
通讯作者 | Yan, MD (通讯作者) |
发表日期 | 2021 |
ISSN | 1674-7313 |
EISSN | 1869-1897 |
起始页码 | 231 |
结束页码 | 252 |
卷号 | 64期号:2 |
英文摘要 | Knowledge on the origin and mechanism of the large potash formation in the southeast Tethyan tectonic domain are still under debate, one of which mainly due to the controversial ages of the potash-bearing strata. Here we present a detailed detrital zircon U-Pb geochronologic-magnetostratigraphic study of the potash-bearing Mengyejing (MYJ) Formation (Fm) from the Simao Basin. 948 paleomagnetic cores and 4 detrital zircon U-Pb samples were collected from a 932-m thick Jiangcheng section. Thermal demagnetization isolated 857 primary characteristic remnant magnetization (ChRM) directions, indicated by positive reversals and fold tests and petrologic examinations. Seven normal and seven reversed polarity zones were identified and correlated well with chrons C27r to C34n of the geomagnetic polarity timescale (GPTS2012), yielding the first known age sequence of >112 to similar to 63 Ma for the MYJ Fm. The ages for the potash bearing strata in the Simao commenced similar to 20 Ma earlier than those in the adjacent Khorat basins, opposite to the traditional viewpoint that the former would rather correspond to the middle and lower parts of the latter. Given the paleogeographic reconstruction of likely a pan-Simao-Khorat basin during the Cretaceous, similar to 85 Ma would be another important potential period for future potash exploration in the Simao Basin. |
关键词 | U-PB GEOCHRONOLOGYDETRITAL ZIRCON PROVENANCENORTHERN SICHUAN BASINSAKHON NAKHON BASINTIBETAN PLATEAUKHORAT PLATEAUCRETACEOUS CLIMATETECTONIC EVOLUTIONCHINA IMPLICATIONSJURASSIC DEPOSITS |
英文关键词 | Simao Basin; Magnetostratigraphy; Potash-bearing sequence; Mengyejing Fm; > 112-similar to 63 Ma; Potash formation |
语种 | 英语 |
WOS研究方向 | Geology |
WOS类目 | Geosciences, Multidisciplinary |
WOS记录号 | WOS:000608667900003 |
来源期刊 | SCIENCE CHINA-EARTH SCIENCES |
来源机构 | 中国科学院青藏高原研究所 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/260403 |
推荐引用方式 GB/T 7714 | Yan, Maodu,Zhang, Dawen,Fang, Xiaomin,et al. New insights on the age of the Mengyejing Formation in the Simao Basin, SE Tethyan domain and its geological implications[J]. 中国科学院青藏高原研究所,2021,64(2). |
APA | Yan, Maodu.,Zhang, Dawen.,Fang, Xiaomin.,Zhang, Weilin.,Song, Chunhui.,...&Shen, Miaomiao.(2021).New insights on the age of the Mengyejing Formation in the Simao Basin, SE Tethyan domain and its geological implications.SCIENCE CHINA-EARTH SCIENCES,64(2). |
MLA | Yan, Maodu,et al."New insights on the age of the Mengyejing Formation in the Simao Basin, SE Tethyan domain and its geological implications".SCIENCE CHINA-EARTH SCIENCES 64.2(2021). |
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