A5051954340- Geoscience and Mining Technology
- Geological and Geochemical Analysis
- Rough Sets and Fuzzy Logic
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies
Harbin Electric Corporation (China)
2024
China University of Petroleum, East China
2019
Preview this conference paper: Origin of Deep Oil Accumulations in Reservoirs within North Tarim Basin: Insights from Molecular and Isotopic Compositions, Page 1 < Previous page | Next > /docserver/preview/fulltext/2214-4609/2019/P305-1.gif
太古代-古元古代地壳在扬子克拉通的出露极为有限,且成分主要为TTG质片麻岩,本文报告了大别山南缘地区新发现的2.5~2.0Ga钾质花岗岩。为明确该陆壳岩石的性质,揭示扬子克拉通的早期演化历史,对花岗岩及同期基性岩进行了锆石U-Pb年代学、元素-同位素地球化学分析及对比研究。两期钾质花岗岩的形成年龄分别为2443~2463Ma、1995~2048Ma,其中前者的Sr含量和Sr/Y值中等,具有-0.1的<i>ε</i><sub>Nd</sub>(<i>t</i>)值和略早于成岩年龄的2.87Ga模式年龄;后者的Sr含量和Sr/Y值相对前者降低,K、Rb、U、∑REE含量和LREE/HREE值升高,具有明显的Nb、Ta亏损,以及-6.8~-9.4的<i>ε</i><sub>Nd</sub>(<i>t</i>)值和远大于成岩年龄的3.03~3.24Ga模式年龄。研究表明,前者代表的地壳成因主要受地幔垂向添加的模式主导,而后者可能已转变为横向增生的板块构造模式,反映了扬子克拉通的主要生长期在太古代,而元古代以后代之以俯冲碰撞导致的壳内重熔和再造。对比显示,大别山南缘所在区域于新太古代-古元...