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Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau
Zhang, DW (Zhang, Dawen)1,2; Yan, MD (Yan, Maodu)1,3; Fang, XM (Fang, Xiaomin)1,3; Yang, YB (Yang, Yibo)1,3; Zhang, T (Zhang, Tao)1; Zan, JB (Zan, Jinbo)1,3; Zhang, WL (Zhang, Weilin)1,3; Liu, CL (Liu, Chenglin)4; Yang, Q (Yang, Qian)5
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
2018
Volume489Issue:0Pages:40-51
DOI10.1016/j.palaeo.2017.08.030
Abstract

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.

Subject Area地质学
WOS IDWOS:000416501000004
Language英语
Indexed BySCIE
KeywordResolution Magneto Stratigraphy Ne Tibetan Plateau Indo-china Block Mae Moh Basin Northern Thailand Qinghai Province Yuanmou Basin Evolution Deposits Paleomagnetism
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
Cooperation Status国内
ISSN0031-0182
Department大陆碰撞与高原隆升重点实验室
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8790
Collection图书馆
Corresponding AuthorYan, MD (Yan, Maodu)
Affiliation1.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
4.Chinese Acad Geol Sci, MLR Key Lab Metallogeny & Mineral Assessment, Inst Mineral Resources, Beijing 100037, Peoples R China;
5.SINA AGRI Mineral Resources Co Ltd, Beijing 100052, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, DW ,Yan, MD ,Fang, XM ,et al. Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2018,489(0):40-51.
APA Zhang, DW .,Yan, MD .,Fang, XM .,Yang, YB .,Zhang, T .,...&Yang, Q .(2018).Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,489(0),40-51.
MLA Zhang, DW ,et al."Magnetostratigraphic study of the potash-bearing strata from drilling core ZK2893 in the Sakhon Nakhon Basin, eastern Khorat Plateau".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 489.0(2018):40-51.
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