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Facies character and geochemical signature in the late Quaternary meteoric diagenetic carbonate succession at the Xisha Islands,South China Sea

引用

Acta Oceanologica Sinica 2021年第3期40卷 94-111页

作者： Wanli Chen Xiaoxia Huang Shiguo Wu Gang Liu Haotian Wei Jiaqing Wu Laboratory of Marine Geophysics and Georesources Institute of Deep-sea Science and EngineeringSanya 572000China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266034China University of China Academy of Sciences Beijing 100049China Institute of Earth and Environmental Science University of PotsdamPotsdam 14476Germany Institute of Marine Geology Survey Bureau of Hainan Marine Geology SurveyHaikou 570206China Key Laboratory of Marine Geological Resources and Environment of Hainan Province Marine Geological Survey Institute of Hainan ProvinceHaikou 570206China College of Marine Geosciences Ocean University of ChinaQingdao 266100China

The late Quaternary shallow-water carbonates have been altered by a variety of diagenetic processes,and further influenced by high-amplitude global and regional sea level *** study utilizes a new borehole drilled on the Yongxing Island,Xisha Islands to investigate meteoric diagenetic alteration in the late Quaternary shallowwater ***,mineralogical,stable isotopic and elemental data provide new insights into the meteoric diagenetic processes of the reef *** results show the variation in the distribution of aragonite,high-Mg calcite(HMC)and low-Mg calcite(LMC)divides the shallow-water carbonates in Core SSZK1 into three intervals,which are UnitⅠ(31.20-55.92 m,LMC),UnitⅡ(18.39-31.20 m,aragonite and LMC)and UnitⅢ(upper 18.39 m of core,aragonite,LMC and HMC).Various degrees of meteoric diagenesis exist in the identified three *** lowermost UnitⅠhas suffered almost complete freshwater diagenesis,whereas the overlying UnitsⅡandⅢhave undergone incompletely meteoric *** amount of time that limestone has been in the freshwater diagenetic environment has the largest impact on the degree of meteoric *** four intact facies/water depth cycles are *** cumulative depletion of elements such as strontium(Sr),sodium(Na)and sulphur(S)caused by duplicated meteoric diagenesis in the older reef sequences are distinguished from the younger reef *** study provides a new record of meteoric diagenesis,which is well reflected by whole-rock mineralogy and geochemistry.

关键词： shallow-water carbonates meteoric diagenesis elemental concentration facies cycles Xisha Islands late Quaternary

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