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theory of granitization metallization
花岗岩化成矿说
矿床地质学
在适当的地质—构造和地球化学背景下,地壳物质经历多次构造—热事件,转变为花岗岩类岩石的过程中,促使许多成矿元素,特别是亲花岗岩元素(W、Sn、Be、Nb、Ta、Rb、Cs等)活化、转移和集中成矿。成矿溶液的成因和来源很复杂,主要是岩层中活化、转移形成的“岩汁”、变质热液、岩浆热液以及下渗的地下水热液和部分幔源的初生水等。由于花岗岩类与许多金属矿床有关,而且绝大多数花岗岩被认为是壳源物质,故这种成矿学说受到人们的重视。
中国气候和构造运动对花岗岩地貌的影响(英文)
Present granite landform characteristics and distribution are the integrated result of climate, tectonics and lithology. Various types of granite landforms in China signify climate zonality and differential vertical movement of earth surface, while published research results on Chinese granite landforms are very rare, especially in international journals. Based on the process analysis of chemical weathering and physical disintegration, four granite landform regions in China are classified according to the present climate regime. On the Tibetan Plateau, the cold and freezing climate induced periglacial landscapes; the northeast region is characterized by physical disintegration and low round mounds are widespread; in the northwest region controlled by arid climate, wind-carved minor landscapes are extremely prominent. The most spectacular granite landscapes in China are presented in southeast as a result of longtime chemical weathering under humid and warm conditions, as well as the differential uplift after Neogene. Correlating the weathering crust in southern China, Tibetan Plateau and India, a possible unified planation surface in Neogene is proposed. With corestones as indicators of original weathering front, the differential uplift extent of dissected planation surfaces can be estimated. At least three landforms implying uplift can be identified in southeastern China, with elevations of 300–400 m, 2000 m and 3600 m above the sea level respectively.
花岗岩及花岗岩景观
花岗岩及花岗岩景观 一、花岗岩 花岗岩特征 1、花岗岩是地面上最常见的酸性侵入体。它质地坚硬,岩性较均一,垂直 节理发育,多构成山地的核心, 成为显著的隆起地形, 在流水侵蚀和重力崩塌作 用下,常形成挺拔险峻、峭壁耸立的雄奇景观。表层岩石球状风化显著,还可形 成各种造型逼真的怪石,具较高的观赏价值。 2、花岗岩由于节理风化、崩塌等作用,常形成峭壁悬崖、孤峰擎天、石柱 林立等奇特景观, 著名的如黄山莲花峰、 炼丹峰和天都峰三峰鼎立, 华山的东西 南北中五峰相峙;天柱山的天柱峰,九华山的观普峰也非常典型。 球形风化景观,著名的有海南的天涯海角、鹿回头、 “南天一柱”,浙江普陀 山的“师石”,辽宁千山的“无根石”,安徽天柱山的“仙鼓峰”和黄山的“仙桃 石”等。 花岗岩山地、丘陵山体。当花岗岩出露地表并处于强烈上升时, 流水沿垂直 节理裂隙下切,形成石柱或孤峰, 石柱、孤峰丛集成为峰林, 如黄山的