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"地貌年龄"与"地质年龄"是不同对象的年龄,不能用地质年龄代替地貌年龄,而且不同海拔高度、不同层次、不同形态的地貌其形成年龄也不同.地学工作者对造景地貌的形成演化研究较多,对各种形态的造景地貌给予科学的解释. 相似文献
94.
《《幕》》2008,31(3):355-355
An "International Workshop on Central Asian Orogenesis and Metallogeny", sup- ported by Department of Science and Tech- nology of Xinjiang Uygur Autonomous Region, the Geosciences Department of the Natural Science Foundation of China, the Bureau of Science and Technology for Resources and Environment, the Chinese Academy of Science, Xinjiang Petroleum Company, and China National Petroleum Corporation, was held in Urumqi, Xinjiang, from 18-24 September, 2007 (hosted by the National 305 Project Office). 相似文献
95.
HOU Zengqian YANG Zhusen LI Yinqing ZENG Pusheng MENG Yifeng Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 《《地质学报》英文版》2004,78(1):203-220
The middle-lower Yangtze area underwent a series of complex tectonic evolution, such as Hercynian extensional rifting, Indosinian foreland basining, and Yanshanian transpression-transtension, resulting in a large distinctive Cu-Fe-Au metallogenic belt. In the tectonic evolution, large-scale migration and convergence of fluids toward foreland basins induced during the collisional orogeny of the Yangtze and North China continental blocks were of vital importance for the formation of the metallogenic belt. Through geological surveys of the middle-lower Yangtze area, three lines of evidence of large-scale fluid migration are proposed: (1) The extensive dolomitic and silicic alteration penetrating Cambrian-Triassic strata generally occurs in a region sandwiched between the metallogenic belt along the Yangtze River and the Dabie orogenic belt, and in the alteration domain alternately strong and weak alteration zones extend in a NW direction and are controlled by the fault system of the Dabie orogenic belt; it 相似文献
96.
石榴石微区化学组成与结构关系及其意义 总被引:2,自引:0,他引:2
恢复岩石的变质作用温度-压力轨迹,重建造山过程中地壳岩块的俯冲(加热)和折返(冷却)过程,是构造地质研究的一个重要方向。石榴石是一种Ca-Mg-Fe-Mn等的固溶体矿物,它可以在各类岩石和非常宽的p-T条件下出现,且容易形成化学成分环带,石榴石这种环带反映了与变质作用相对应的构造热演化阶段。目前研究岩石构造热演化一个常 相似文献
97.
Geology and D-O-C Isotope Systematics of the Tieluping Silver Deposit,Henan, China: Implications for Ore Genesis 总被引:22,自引:0,他引:22
Franco PIRAJNO 《《地质学报》英文版》2005,79(1):106-119
The Tieluping silver deposit, which is sited along NE-trending faults within the high-grade metamorphic basement of the Xiong‘er terrane, is part of an important Mesozoic orogenic-type Ag-Pb and Au belt recently discovered. Ore formation includes three stages: Early (E), Middle (M) and Late (L), which include quartz-pyrite (E),polymetallic sulfides (M) and carbonates (L), respectively. The E-stage fluids are characterized by δD=-90%c,δ^13CCO2=2.0‰ and δ^18O=9‰ at 373℃, and are deeply sourced; the L-stage fluids, with δD=-70‰, δ^13C CO2=-1.3%c and δ^18O=-2‰, are shallow-sourced meteoric water; whereas the M-stage fluids, with δD=-109‰, δ^13C CO2=0.1%c and δ^18O2‰, are a mix of deep-sourced and shallow-sourced fluids. Comparisons of the D-O-C isotopic systematics of the Estage ore-forming fluids with the fluids derived from Mesozoic granites, Archean-Paleoproterozoic metamorphic basement and Paleo-Mesoproterozoic Xiong‘er Group, show that these units cannot generate fluids with the measured isotopic composition (high δ^180 and δ^13C ratios and low δD ratios) characteristic of the ore-forming fluids. This suggests that the E-stage ore-forming fluids originated from metamorphic devolatilization of a carbonate-shale-chert lithological association, locally rich in organic matter, which could correspond to the Meso-Neoproterozoic Guandaokou and Luanchuan Groups, rather than to geologic units in the Xiong‘er terrane, the lower crust and the mantle. This supports the view that the rocks of the Guandaokou and Luanchuan Groups south of the Machaoying fault might be the favorable sources. A tectonic model that combines collisional orogeny, metallogeny and hydrothermal fluid flow is proposed to explain the formation of the Tieluping silver deposit. During the Mesozoic collision between the South and North China paleocontinents, a crustal slab containing a lithological association consisting of carbonate-shale-chert, locally rich in organic matter (carbonaceous shale) was thrust northwards beneath the Xiong‘er terrane along the Machaoying fault.Metamorphic devolatilization of this underthrust slab provided the ore-forming fluids to develop the Au-Ag-(Pb-Zn) ore belt, which includes the Tieluping silver deposit. 相似文献
98.
造山带概念的演变及它在现今大陆构造研究中面临的问题 总被引:3,自引:0,他引:3
造山运动和造山带是应用普遍和影响广泛的两个古老概念,一百多年来随着地球科学的快速发展和板块构造理论出现,情况已发生很大的变化。如何修订这一概念的内涵使之适应新的认识而又保持原定义的首尾-贯正受到普遍关注。作为2000年中国构造地质学发展回顾与展望学术讨论会的一个专题,本文回顾了上述概念产生的历史背景,分析了它们在板块构造理论框架下,特别是在现今大陆构造研究中所面临的挑战;提出并归纳了讨论中形成有关新形势下造山带概念的再理解和应用范围的共识。 相似文献
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本文以活动论的观点,系统分析了浙江各地质时期构造阶段的划分及其主要特征,提出了造山运动和升降运动鉴别的主要标志,阐述了地壳运动专用名称的存留方案。 相似文献