| 壳幔化学不均一性与块体地球化学边界研究 |
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| 引用本文： | 朱炳泉.壳幔化学不均一性与块体地球化学边界研究[J].地学前缘,1998,5(1):72-82. |
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| 作者姓名： | 朱炳泉 |
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| 作者单位： | 中国科学院广州地球化学研究所 |
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| 基金项目： | 国家科委攀登计划A和B项,国家自然科学基金会重大项目 |
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| 摘 要： | 壳幔派生岩石的多元同位素体系研究表明，地球存在块体的化学不均一性，可划分出地球化学省，并以地球化学急变带作为边界。全球总体上分成东冈瓦纳（如华夏与青藏—印支）、西冈瓦纳、太平洋（如佳木斯、中蒙古、辽胶渤、北疆—南戈壁）与劳亚（如华北、中朝、兴安、塔里木等）四种类型的地球化学省。地球化学急变带与地球物理场变化存在密切关系。在构造上，地球化学急变带可分成构造显性与构造隐性两种类型。应用深、浅构造立交模型及其相互转化可对两种类型地球化学急变带的出现作出较合理的解释。地球化学急变带，特别是急变带的转折端对超大型矿床和成矿密集区的分布有密切控制作用；显性急变带主要表现为与动力变质和岩浆活动有关的改造成矿作用，隐性急变带主要表现为火山与热水沉积成矿作用。具有工业意义的油气田均位于构造隐性急变带与中新生代盆地的立交地段。
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| 关 键 词： | 壳幔化学不均一性 同位素填图 地球化学急变带 超大型矿床 油气田 |
STUDY ON CHEMICAL HETEROGENEITIES OF MANTLE CRUSTAL SYSTEMS AND GEOCHEMICAL BOUNDARIES OF BLOCKS |
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| Zhu Bingquan.STUDY ON CHEMICAL HETEROGENEITIES OF MANTLE CRUSTAL SYSTEMS AND GEOCHEMICAL BOUNDARIES OF BLOCKS[J].Earth Science Frontiers,1998,5(1):72-82. |
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| Authors: | Zhu Bingquan |
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| Abstract: | The studies on multi isotopic systematics of rocks derived from mantle and crust show that there exist chemical heterogeneties of blocks in the golbe, in which geochemical provinces of four types with geochemical steep zones as boundaries can be distinguished. They are the East Gondwana(such as Cathaysia and Tibet Indochina in Continental China), the West Gondwana, the Pacific(such as Jiamusi, Central Mongolia, Liaojiaobo, North Xinjiang, South Gobia) and the Laurasia(such as North China, China Korea, Xing'an and Tarim). There exists a tight relationship between the geochemical and geophysical steep zones. Geochemical steep zones in tectonics can be classified as two kinds; i.e.the tectonic dominance and the recessiveness, which can be well explained in the light of a tectonic flyover model between surface and buried structures as well as their transition from each other. The distribution of super large deposits and mineralization intensive domains are tightly controlled by the geochemical steep zones, especially at their turning points; in which reconstruction mineralization associated with dynamic metamorphism and magmatism occurs mainly on the dominant steep zones, whereas volcanism and MVT deposits are related to the recessive geochemical boundaries. The most of oil fields with industrial index are also located at the cross districts between basin and tectonic recessive geochemical boundaries. |
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| Keywords: | chemical heterogeneties of crust and mantle isotopic mapping geochemical steep zone super large deposits oil gas fields |
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