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排序方式: 共有693条查询结果,搜索用时 31 毫秒
51.
以阳信洼陷下第三系火山层序为例,探讨了火山活动等事件对层序发育晚期可容空间产生与分布的影响.阳信洼陷下第三系火山层序发育的特征及湖退时期的可容空间变化特征表明,火山锥在断陷湖盆中的堆积使得盆地中可容空间演化特征与常见断陷湖盆不同,局部可容空间的分配出现非均一性特征.研究表明,火山锥体使湖退时期可容空间分布复杂化,是可容空间分布呈现非均一性的直接原因.进而丰富了层序地层学的内容. 相似文献
52.
Fluid inclusions evidence for differential exhumation of ultrahigh pressure metamorphic rocks in the Sulu terrane 总被引:6,自引:0,他引:6
FAN Hongrui GUO Jinghui HU Fangfang CHU Xuelei CHEN Fukun & JIN Chengwei State Key Laboratory of Lithosphere Tectonic Evolution Key Labo- ratory of Mineral Resources Institute of Geology Geophysics Chi- nese Academy of Sciences Beijing China Correspondence should be addressed to Fan Hongrui 《科学通报(英文版)》2005,50(11):1139-1148
Since the discovery of coesite and diamond inclusions in eclogites from the Dabie-Sulu orogen, east-central China[1―3], this largest ultrahigh pressure (UHP) metamor- phic terrane in the world has attracted extensive scientific interests. A number of hydrous minerals such as zoisite, phengite, magnesite and talc have been found in the UHP rocks, showing that fluids have played an important role in this type of extreme metamorphic evolution[4―8]. Sev-eral techniques have been applied to th… 相似文献
53.
节理岩体中微裂纹区的推导 总被引:2,自引:0,他引:2
在一个改进的节理岩体强度和提出均方剪应力基础上,导出一个屈服准则,结合断裂力学理论,推导出一新的微裂纹区域,最后与Mises屈服准则的推导结果作比较得出一些结论。 相似文献
54.
Geochronology of source materials from high-pressure and ultrahigh-pressure metamorphic rocks in Jurassic sedimentary rocks of Hefei Basin 总被引:4,自引:0,他引:4
LI Renwei SANG Haiqing ZHANG Renhu CHU Zhuyin LI Shuangyin JIN Fuquan & JIANG Maosheng . Institute of Geology Geophysics Chinese Academy of Sciences Beijing China . Department of Resource Environment Sciences Hefei Industrial University Hefei China 《科学通报(英文版)》2003,48(6):605-610
Eclogite cobbles were discovered by Wang et al. (2001) in the Fenghuangtai Formation of the northern margin of Dabie Mountains in the Dushan area of Anhui Province, China[1]. They proposed that after the formation during the Triassic, the high-pressure (HP) and ultra-high-pressure (UHP) metamorphic rocks reached the sur-face through exhumation and uplifting before the late Ju-rassic. However, they have not provided any evidence about isotopic ages. One kind of cobbles of HP-UHP rocks w… 相似文献
55.
岩石力学实验表明 ,处于脆性、半脆性 -半延性域的岩石 ,其变形经历两个阶段 ,前期的变形相对均匀分布阶段和后期的变形集中化阶段。把此认识应用于四川盆地加里东古隆起的形成研究中 ,得到 :古隆起及周围岩石圈古生代在区域拉张力的作用下 ,先经历了变形相对均匀分布阶段 (Zb- O) ,形成了乐山 -龙女寺及天井山古隆起 ;后经历了变形渐进式集中化阶段(S- P) ,先形成了乐山 -龙女寺与天井山联合古隆起 (S) ,后形成了更大范围的联合古隆起 (D- P) ;后期阶段的变形主要集中于龙门山断裂等少数断裂上。 相似文献
56.
苏北盆地油气田的形成与分布特征 总被引:24,自引:1,他引:23
钱基 《石油大学学报(自然科学版)》2000,24(4):21-25
苏北-南黄海盆地与渤海湾盆地之间以鲁苏隆起相隔,对称分布于郯庐断裂。研究表明,由于两盆地所处的区域构造背景不同,致使其盆地演化、成烃演化、资源丰度和油气田规模差异很大。壳幔结构的同相性、晚始新世至渐新世18Ma的沉积间断、有机质演化程度低、断裂活动改造强虺昌形成苏北盆地小、碎贫、菜含油气特征的主要因素。苏北盆地与渤海盆地存在的成藏条件差异及其分布规律表明,苏北盆地缺乏形成巨型、大型油气田的条件,其 相似文献
57.
Seismic tomography showing subduction and slab breakoff of the Yangtze block beneath the Dabie-Sulu orogenic belt 总被引:7,自引:0,他引:7
Seismic tomography reveals that a subducted ancient block has been preserved beneath the Moho of the Dabie-Sulu orogenic belt.
Taking into account of geological and geochronological data, we inferred from the tomographic images that the Yangtze block
was subducted northward beneath the Sino-Korean block and broken off at the depth <200 km during 200—190 Ma. The slab breakoff
of the Yangtze block is the most important dynamic mechanism to control the exhumation of UHP rocks. 相似文献
58.
Shoshonitic intrusive suite in SE Guangxi: Petrology and geochemistry 总被引:17,自引:0,他引:17
A NE-direction Mesozoic shoshonitic intrusive suite in SE Guangxi has been identified in terms of geological, petrological
and geochemical investigations. The shoshonitic intrusives are characterized by enrichment of LILE, HFSE and LREE and no obvious
Nb-Ta depletion, similar to those potassic rocks formed in within-plate and rifting environments. Unlike most shoshonitic
rocks forming in arc settings, the SE Guangxi shoshonitic intrusives were likely generated during regional lithosphere extension
induced by upwelling of asthenosphere mantle. 相似文献
59.
Geologic relationships and geochronology of the Cenozoic volcanoes and interbedded weathered mantles of Yulinshan in Qiangtang, North Tibet 总被引:2,自引:0,他引:2
The Yulinshan accumulations of volcanic rocks and interbedded weathered mantles provide a unique chance for studying the processes
and environment of the formation of the planation surface in central Tibetan Plateau. Geochemical,40Ar/39Ar and K/Ar geochronologic investigations of the weathered mantles and high-potassium volcanic rocks reveal that the volcano-weathered
mantle accumulations formed under arid or semi-arid subtropic environment in 30–24 Ma. The sole planation surface of the Qiangtang
region finally formed in about 20 Ma. 相似文献
60.
Late Mesozoic interaction between crust and mantle in coastal area of Zhejiang-Fujian 总被引:11,自引:0,他引:11
This paper summarizes the lithogeochemical features of composite lavas, dikes and plutons composed of early Cretaceous associated basic-acidic igneous rocks from the coastal area of Zhejiang-Fujian. On the basis of the studies on Nd, Sr, Pb isotopic signatures and geochemical characteristics of large ion lithophile elements (L1LE) , light rare earth elements (LREE) and high field strong elements ( HFSE) of these contemporary basic-acidic igneous rocks, it is considered that the source enrichment caused by the subduction of Pacific plate and contamination of crustal rocks and melts during ascending process may lead to the formation of basaltic magmas with a high LILE concentration. These late Mesozoic composite basic-acidic igneous rocks are the products of the interactions between crust and mantle in active continental margin. 相似文献