Preliminary results of rock magnetism and magnetostratigraphy for Late Miocene to Pliocene biogenetic reefs in the Xisha Islands, South China Sea
Wang Zhen-Feng1; Zhang Dao-Jun1; Liu Xin-Yu1; You Li1; Luo Wei1; Yi Liang2,3; Zhu You-Hua (祝幼华)4; Qin Hua-Feng2; Xie Qiang5; Che Zhi-Wei6

The South China Sea (SCS) in West Pacific Ocean is the largest marginal sea in Asia. Due to the unique location, its Cenozoic evolution has been attracting great attentions during the past decades. As one of the most debated issues, geochronological frameworks of the SCS basin have been widely investigated mainly based on geophysical data or regional unconformities. As one of two major types of depositions (terrigenous and marine biogenic) in this critical region, numerous coral reefs have been developed on the Xisha-Zhongsha terrain since the early Miocene. Previous studies of the Xisha carbonate platforms have mainly focused on the analyses of sedimentology, tectonics, and modern ecology, but little geochronological work, which ought to be an important component of such researches, has been performed. This lack of geochronological information significantly hinders our understanding of the initiation and development of these biogenic reefs. Herein, multi-parameter rock magnetic measurements, including isothermal remanent magnetization (IRM) acquisition, hysteresis loops-and magnetic scanning, were performed on typical samples collected from Borehole XK-1 in the Xisha Islands. The results suggest the predominance of ferrimagnetic phases in the XK-1 biogenic reefs, and the average sizes of magnetic mineral grains are relatively coarse, falling within the pseudo-singledomain to multidomain-like grain size region. Further mathematical partitioning demonstrates the predominance of low-coercivity component (mainly magnetite). Considering that the study area is far away from the East Asian continent and the growing process of the biogenic reefs, it is inferred that the main magnetic mineral in biogenetic reefs is magnetite, which is from terrestrial detrital materials and absorbed or filtered into the reef with its growth. Further magnetostratigraphic study shows that the identified normal and reverse magnetozones can be correlated with geomagnetic polarity time scale (GPTS), providing several reliable age constraints for those reefs. It records C2An.3n and C3n.4n chrons in the Yinggehai Formation, and C3An.2n to C5n.2n chrons in the Huangliu Formation. Our new magnetostratigraphic findings have provided valuable geochronologic constraints for regional stratigraphic correlation and paleoenvironmental processes.

KeywordSouth China Sea Xisha Islands Biogenetic Reef Rock Magnetism Magnetostratigraphy
WOS KeywordMarginal Basins ; Tectonics ; Framework ; Sequence ; Asia
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000387300200020
Document Type期刊论文
Corresponding AuthorYi Liang
Affiliation1.China Natl Offshore Oil Corp, Zhanjiang Branch, Zhanjiang 524057, Guangdong, Peoples R China
2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Key Lab Econ Stratig & Palaeogeog, Nanjing 210008, Peoples R China
5.Chinese Acad Sci, Inst Deepsea Sci & Engn, Sanya Hainan 572000, Peoples R China
6.State Ocean Adm, Haikou Marine Environm Monitoring Cent Stn, Haikou 570311, Peoples R China
7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
8.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Peoples R China
9.Chengdu Univ Technol, Minist Land & Resource, Key Lab Tecton Controls Mineralizat & Hydrocarbon, Chengdu 610059, Peoples R China
Recommended Citation
GB/T 7714
Wang Zhen-Feng,Zhang Dao-Jun,Liu Xin-Yu,et al. Preliminary results of rock magnetism and magnetostratigraphy for Late Miocene to Pliocene biogenetic reefs in the Xisha Islands, South China Sea[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2016,59(11):4178-4187.
APA Wang Zhen-Feng.,Zhang Dao-Jun.,Liu Xin-Yu.,You Li.,Luo Wei.,...&Zhu Ri-Xane.(2016).Preliminary results of rock magnetism and magnetostratigraphy for Late Miocene to Pliocene biogenetic reefs in the Xisha Islands, South China Sea.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,59(11),4178-4187.
MLA Wang Zhen-Feng,et al."Preliminary results of rock magnetism and magnetostratigraphy for Late Miocene to Pliocene biogenetic reefs in the Xisha Islands, South China Sea".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 59.11(2016):4178-4187.
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