初论地幔热柱与成矿     

李红阳  阎升好  王金锁  张建珍  王国富 《矿床地质》1996,(3)

作者通过对冀西北金、银多金属矿化集中区成矿规律和物探航磁、重力及遥感信息的综合研究，提出冀西北地区存在一个超越内蒙地轴与燕山褶皱带两个不同历史大地构造单元之上的中生代地幔热柱构造。文中例举了地幔热柱构造标志特征，探讨了地幔热柱构造地质作用（超变质作用、岩浆作用、成矿作用）及其时空演化规律，建立了地幔热柱构造的壳幔成矿模式  相似文献   

湘中锑矿深源流体的地幔柱成矿演化   总被引：16，自引：0，他引：16  

黎盛斯 《湖南地质》1996,15(3):137-142

深源流体在地幔柱热驱动下，历经长期壳幔循环，形成高浓度古水热成矿流体，为湘中锑的成矿蓄积丰沛的矿源。  相似文献   

中国大陆上地幔顶部地震波平均速度分布特征及中新生代陆相盆地成因模式探讨     

刘建生  李国华  颜彬  刘建华 《江苏地质》1996,20(2)

由中国大陆地震级三维速度图象求取中国大陆上地幔顶部(50—200km深度内)平均速度图,通过它的分布特征分析,结合中国大陆1°×1°平均布格重力异常图,把中国大陆地幔顶部分为5个不同特征的构造域,并探讨了各域内中新生代陆相盆地的成因模式及其动力学原因。  相似文献   

吉林伊通幔源包体的氧同位素组成   总被引：1，自引：0，他引：1  

徐义刚  林传勇 《矿物岩石地球化学通报》1996,(3)

吉林伊通幔源包体的氧同位素组成徐义刚，Ｍ．Ａ．ＭｅｎｚｉｅｓＤ．Ｐ．Ｍａｔｔｅｙ林传勇（中国科学院广州地球化学研究所，广州５１０６４０）（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，ＲｏｙａｌＨｏｌｌｏｗａｙＵｎｉｖｅｒｓｉｔｙｏｆＬｏｎｄｏｎ，Ｅｇｈａ...  相似文献   

白银厂铜多金属矿床——壳幔交代中的地幔流体成矿探讨     

任秉琛 《地球学报》1996,17(Z1):57-63

依据深部构造、火山岩建造与基性和钙碱性、中酸性、酸性火山岩的双峰式火山作用，确定白银厂矿田、矿床形成于切割硅铝层的古裂谷构造环境。其中小铁山、铜厂沟等矿床和折腰山、火焰山矿床两次成矿事件与双峰式火山活动同时发生，成矿作用与酸性火山岩具有时空上的一致性。矿石中CO2流体包裹体除H2O含量高外，与上地幔CO2流体包裹体成分一致；矿石富含大离子亲石元素和具富Mg、K的成矿蚀变元素组合，硫和铅来自下地壳或上地幔。喷气硅质岩锶同位素初始值表明，矿质来源于不均一地幔，S/Se、Co/Ni、Se/Te值亦指示矿质来源于深部。 本文提出矿床形成于强烈扩张的裂谷期，断裂的延深生长使地幔深部产生去挥发作用，释放大量CO2和含金属元素的地幔流体与上地幔基性岩浆向地壳侵入，导致下地壳熔融，形成酸性岩浆。与酸性岩浆喷发的同时，富含挥发份和金属元素的高盐度热卤水，沿断裂上升流入海底沉积成矿。  相似文献   

Comparison between tomographic structures and models of convection in the upper mantle   总被引：1，自引：0，他引：1  

Pierre Vacher  Antoine Mocquet  Christophe Sotin 《Geophysical Journal International》1996,124(1):45-56

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Observation of converted Moho reflections in the north-west of the Iberian Peninsula     

Julia Téllez  Diego Córdoba 《Geophysical Journal International》1996,124(1):7-17

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Arc-type and intraplate-type ridge basalts formed at the trench-trench-ridge tripIe junction: Implication for the extensive sub-ridge mantle heterogeneity     

Soichi  Osozawa Takeyoshi  Yoshida 《Island Arc》1997,6(2):197-212

Abstract ' In situ basalts' represent the ridge magmatism at and close to the ancient trench-trench-ridge triple junction. Such basalts in the Amami, Mugi, and Setogawa accretionary complexes, Southwest Japan, were described and analysed. The geochemical data show that the ' in situ basalts' include all the types of basalts, ranging from alkali basalts and high-alumina basalts to tholeiites, and the compositions tend towards intermediate and silicic rocks. The data also reveal that the ridge basalts are indistinguishable both from the island arc and intraplate basalts, no affinities with mid-ocean-ridge basalts. The sub-ridge mantle adjacent to the triple junction had a component of sub-arc mantle, and this mantle heterogeneity can be generated by the formation of a slab window.  相似文献   

Tectonic and geochemical characteristics and reserved conditions of a mantle source gas accumulation zone in eastern China   总被引：8，自引：0，他引：8  

Mingxin Tao  Yongchang Xu  Ping Shen  Wenhui Liu 《中国科学D辑(英文版)》1997,40(1):73-80

Along both sides of the Tancheng-Lujiang Fracture Zone in eastern China, a series of mantle source gas pools constitute a massive-scale tectonic accumulation zone in NNE direction, with the mantle geochemical characteristics of high concentrations of C0₂ and He, high³He/⁴He-⁴⁰Ar/³⁶Ar ratio system and high δ¹³Coo₂ ratios (the main frequency, -3.4%— 4.6%), showing no difference from the tectonic framework of the area. In the area, the tectonic environment is a rift formed as a result of diapiric mantle injection and crust thinning to form graben-type basins and lithospheric fractures. The mantle-derived volcanic rocks and inclusions are well-developed and a high geothermal zone (mantlesource) exists in the area. The characteristics of the three components (solid, liquid and gas) of mantle, concentrated all over the same tectonic space zone, show that the rift system is of a good tectonic environment or passage for mantle degassing and gas migration. The main types of the gas pools are volcano, fault-block, anticline, buried hill and so on, but most of them are combination traps closely related with fracture. For the mantle source gas pools, rift is an optimum tectonic region, and nearby lithospheric fracture, mantle source volcanic rocks or basement uplifts are a favourable structural location when reservoir-caprock association develops.  相似文献   

The focal mechanism solution of the M _s 6.5 Wuding earthquake in Yunnan Province of October 24, 1995     

Shu-Tian Ma  Wei Zhao 《地震学报(英文版)》1997,10(3):307-312

The focal mechanism of Wuding earthquake with magnitude M=6.5 on October 24, 1995 is estimated by the method of inversion of seismic tensor in this paper. The two principal axes are nearly horizontal, the principal compressive axis is about N30°E, the nodal plane which strikes about N105°E (N75°W) is probably consistent with the actual rupture plane.  相似文献