气候变化领域集成服务门户(CCPortal): Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau

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DOI	10.1016/j.palaeo.2017.08.030
	Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau
	Zhang, Dawen; Yan, Maodu; Fang, Xiaomin; Yang, Yibo; Zhang, Tao; Zan, Jinbo; Zhang, Weilin; Liu, Chenglin; Yang, Qian
通讯作者	Yan, MD (通讯作者)
发表日期	2018
ISSN	0031-0182
EISSN	1872-616X
起始页码	40
结束页码	51
卷号	489
英文摘要	The Khorat Plateau holds one of the world's largest potash deposits. Although many attempts have been made, the age of the potash-bearing strata remains poorly determined. Here, we report a high resolution magnetos-tratigraphic study of a 595.4 m-deep potash bearing borehole (ZK2893) in the southeast Sakhon Nakhon Basin in central Laos. This borehole penetrated the whole potash-bearing Nong Boua Formation and reached the underlying sandstone beds of the Nam Noy Formation. A total of 500 (383 level) cubic paleomagnetic samples were collected. k-T curves and hysteresis loops revealed that hematite and magnetite were the main magnetic carriers and were likely of detrital origin, as indicated by microscopic and Electron Microprobe Analysis (EMPA) examinations. Progressive thermal and alternating field (AF) demagnetization isolated 229 valid characteristic remnant magnetizations (ChRMs), which showed a normal and antipodal distribution of the inclination data. Both the microscopic and EMPA examinations and inclination-only analysis suggest primary magnetizations of the ChRMs, yielding nine normal and seven reversed polarity zones. Combined with regional palynological, isotopic and sedimentologic evidence, the obtained polarity zones were best correlated to the geomagnetic polarity time scale of Gradstein et al. (2012) (GPTS2012), yielding magnetostratigraphic ages of > 63.5 Ma to similar to 92 Ma for the potash-bearing Nong Boua Formation and 85 Ma for the potash bed in its lower salt unit.
关键词	RESOLUTION MAGNETO STRATIGRAPHY NE TIBETAN PLATEAU INDO-CHINA BLOCK MAE MOH BASIN NORTHERN THAILAND QINGHAI PROVINCE YUANMOU BASIN EVOLUTION DEPOSITS PALEOMAGNETISM
英文关键词	Thakhek; Nong Boua Formation; Paleomagnetic inclination; Late Cretaceous; Indochina
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000416501000004
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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/259203
推荐引用方式 GB/T 7714	Zhang, Dawen,Yan, Maodu,Fang, Xiaomin,et al. Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau[J]. 中国科学院青藏高原研究所,2018,489.
APA	Zhang, Dawen.,Yan, Maodu.,Fang, Xiaomin.,Yang, Yibo.,Zhang, Tao.,...&Yang, Qian.(2018).Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,489.
MLA	Zhang, Dawen,et al."Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 489(2018).