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| 1 | Foraminiferal biostratigraphy of the Miocene Qom Formation, northwest of the Qom, Central Iran显示文摘在 Dochah 附近,在 Qom 形成的类型区域,中央伊朗,中新世部分在远洋的外形被开发。从 894.1 米厚, a 到这节的 e 成员, 152 件样品被收集。丰富的 planktonic 有孔虫类让我们相关有全球 planktonic 有孔虫类 biozonations 的学习节。在学习节的有孔虫类的高差异允许我们使学习继任适应全球 biozonations。27 个类和 34 种从 Dochah 节第一次被报导。首先,在这节的上面的部分的 Praeorbulina sicana 和 Praeorbulina transitoria 的报告导致了 Praeorbulina sicana 的识别有晚迟了的 Burdigalian 年龄的更低的出现 subzone (M5a ) biozone。 | Jahanbakhsh DANESHIAN Leila RAMEZANI DANA | 2018 | Frontiers of Earth Science2018，12，1： | 0 |
| 2 | Facies character and geochemical signature in the late Quaternary meteoric diagenetic carbonate succession at the Xisha Islands,South China Sea显示文摘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 changes.This study utilizes a new borehole drilled on the Yongxing Island,Xisha Islands to investigate meteoric diagenetic alteration in the late Quaternary shallowwater carbonates.Petrographic,mineralogical,stable isotopic and elemental data provide new insights into the meteoric diagenetic processes of the reef limestone.The 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 units.The lowermost UnitⅠhas suffered almost complete freshwater diagenesis,whereas the overlying UnitsⅡandⅢhave undergone incompletely meteoric diagenesis.The amount of time that limestone has been in the freshwater diagenetic environment has the largest impact on the degree of meteoric diagenesis.Approximately four intact facies/water depth cycles are recognized.The 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 sequences.This study provides a new record of meteoric diagenesis,which is well reflected by whole-rock mineralogy and geochemistry. | Wanli Chen Xiaoxia Huang Shiguo Wu Gang Liu Haotian Wei Jiaqing Wu | 2021 | Acta Oceanologica Sinica2021，40，3： | 0 |
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