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311.
A preliminary study on sediment flux in the Changjiang Delta during the postglacial period 总被引:12,自引:0,他引:12
During the last 7000 years since the Changjiang Delta was formed, how much sediment brought by the Changjiang River remained in the modern Changjiang Delta? And how much sediment was delivered into the sea and adjacent coasts? These are very important que… 相似文献
312.
To study the seismogeny process or the precursory behavior of the 1976 M S=7.0 Lijiang earthquake, we analyze the repeat gravity data with high precision from the Western Yunnan Earthquake Prediction Experiment Area (WYEPEA) and the related results of geology and geophysics survey in this paper. Considering the gross errors caused by observation data and model difference, we have firstly inverted the slip distribution of the main active faults with time based on the robust Bayesian least squares estimation and multi-fault dislocation model. The results show that the slip changes of the faults with time from 1990 to 1997 obviously reflect the preparation process of the Lijiang earthquake. The images of main precursor mode have the characteristic of main shock-after shock type, which is agreement to the model of coupling movement between crust density and crust deformation (DD mode of coupling movement). 相似文献
313.
Permian radiolarians,chert and basalt from the Daxinshan Formation in Lancangjiang belt of southwestern Yunnan,China 总被引:2,自引:0,他引:2
Qinglai?FengEmail author Shangyue?Shen Benpei?Liu Dietrich?Helmcke Xianggui?Qian Weiming?Zhang 《中国科学D辑(英文版)》2002,45(1):63-71
The stratigraphical sequences composed of chert and basalt were found in the Daxinshan area of Simao and the Manbie area of
Jinghong, southwestern Yunnan. The Middle Permian to ealiest Late Permian radiolarians, such as Follicucullus and Pseudoalbaillella,
have been identified from the chert. The chert from the Manbie area of Jinghong is characterized by high SiO2content (over 92%), large ratios of MnO/TiO2 (2.15) and low ratios of Al/(Al+Fe+Mn) (≤0.1) and Ce/Ce*(0.4), which indicate that the chert was deposited in pelagic basin.
The chert from the Daxinshan area of Simao, however, is characterized by low SiO2 content, low ratios of MnO/TiO2 (0.27) and high ratios of Al/(Al+Fe+Mn) (0.49) and Ce/Ce*(0.88), which imply that the chert was deposited in continental
margin basin. The basalts from the both areas belong to tholeiite series, and the chemical compositions of their major, rare
earth and trace elements show the characteristics of MORB. These results evidence that there are volcanic rocks and chert
sequences representing pelagic basin and oceanic basin near continent. These sequences and the formerly reported island-arc
volcanic rock sequences imply that the Daxinshan Formation in the Lancangjiang belt represents a sedimentary assemblage formed
in active continental margin basin. 相似文献
314.
山西义兴寨金矿床金矿物颗粒的产出及其成矿动力学意义 总被引:1,自引:0,他引:1
山西义兴寨金矿床的金主要呈包体金和裂隙金两种产出状态.文章根据成矿地球化学动力学理论,论证了金元素在含矿断裂发生脆性破裂和脆-韧性扩张活动中析出的化学反应类型,以及受反应动力学条件的制约,形成矿石中金不同产出状态的规律.指出热液矿床中普遍存在的包体金为热液成矿早期阶段断裂发生脆性破裂和成矿流体沸腾,导致快速反应结晶的产物;而裂隙金和晶隙金为成矿晚期金等矿质在流体中残余富集,同时成矿断裂再次发生脉动破裂,即成矿热力学演化与有利的构造动力学因素耦合作用的结果.得出金矿物颗粒的产出状态具有成矿动力学意义的结论. 相似文献
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