剪切蚀变与物质迁移及金的富集——以胶东矿集区为例

邓军; 方云; 杨立强; 丁式江; 肖荣阁; 彭润民; 王建平

Volume 25 Issue 4

Jul. 2000

Turn off MathJax

Article Contents

Article Navigation > Earth Science > 2000 > 25(4): 428-432

DENG Jun, FANG Yun, YANG Li-qiang, DING Shi-jiang, XIAO Rong-ge, PENG Run-min, WANG Jian-ping, 2000. ORE-FORMING DYNAMICS OF TECTONIC REGIME TRANSFORMATION AND MULTI-LAYER FLUID CIRCULATION. Earth Science, 25(4): 428-432.

Citation:

PDF( 316 KB)

ORE-FORMING DYNAMICS OF TECTONIC REGIME TRANSFORMATION AND MULTI-LAYER FLUID CIRCULATION

1.
Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China
2.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
3.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China

Received Date: 2000-03-26
Publish Date: 2000-07-25

Abstract

Abstract

In a metallogenic system, tectonism and fluid process occurred at the same time and therefore, they are coupled with each other. The action of ore-forming fluids is bound up with formation and evolution of ore-controlling structures. Structural-fluid temporal-spatial evolution track is, in essence, the mobilization, migration, aggregation and location process of ore-forming materials, i.e. the coupled process of structural fluid mineralization. In this paper, the geological analysis for the gold-deposit concentration region of Jiaodong, Shandong Province, China, is conducted with the Gresens' equation, Grant's isocon diagram and O'hara microelement calculation method, to reveal the interactions among the shear tectonic deformation, the wall-rock alteration, mass transfer and gold mineralization. The research results show that the shear deformation and hydrothermal alteration not only include the deformational condition, feature and mechanism of the shear zone, but also are related to the formation, component, flow or circulation model and flux of the fluids in the zone, resulting in the reallocation of elements and the migration of the chemical materials. During the shear-alteration process in the Jiaodong gold concentration area, all kinds of components were transferred in different amounts, the fluid-rock ratio was relatively high and the volume strain was of dilation type. The major reason for this mineralization is the mobilization, migration and enrichment of ore-forming elements induced by the shear compressive-extensional tectonism. The low-grade ores dominated by the inclusion gold were formed in the early ore-forming stage, while the high grade ores containing fissure gold and polymetallic veinlets were formed in the late ore-forming stage.
- shear-alteration,
- mass transfer,
- ore-forming process

FullText(HTML)

References(15)

References

[1]	Ramsay J G, Graham R H. Strain variation in shear belt[J]. Can J Earth Sci, 1970, 7: 789~801.
[2]	Bonnemaison M. "Filons de aurifere"an cas particulier de shear aurifere[J]. Chron Rech Min, 1986, 482: 55~66.
[3]	邓军, 翟裕生, 杨立强, 等. 论剪切带构造成矿系统[J]. 现代地质, 1998, 12(4): 493~500. https://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ804.005.htm
[4]	邓军, 杨立强, 孙忠实, 等. 剪切带构造成矿动力机制与模式[J]. 现代地质, 1999, 13(1): 1~7. https://www.cnki.com.cn/Article/CJFDTOTAL-XDDZ902.000.htm
[5]	邓军, 翟裕生, 杨立强, 等. 剪切带构造-流体-成矿系统动力学模拟[J]. 地学前缘, 1999, 6(1): 115~129. doi: 10.3321/j.issn:1005-2321.1999.01.010
[6]	Gresens R L. Composition-volume relationships of metasomatism[J]. Chemical Geology, 1967, (2): 47~65.
[7]	James A Grant. The isocon diagram—a simple solution to greses equation for metasomatic alteration[J]. Economic Geology, 1986, 81: 1976~1982. doi: 10.2113/gsecongeo.81.8.1976
[8]	O'hara. Fluid flow and volume loss during mylonitization: an origin for phyllonite in an overthurst setting, North Carolina, USA[J]. Tectonophysics, 1988, 156: 21~36. doi: 10.1016/0040-1951(88)90280-6
[9]	Dong F X, Li Z J, Chen B L, et al. A study on high-temperature and high-pressure experiment of correlativity between deformational system of Aubearing rocks element adjustments[J]. Acta Geologica Sinica, 1999, 73(1): 40~46. doi: 10.1111/j.1755-6724.1999.tb00810.x
[10]	Детников Ф А. Кпроблеме вертикальной зональности и рудоносности глубинных разломов докембрия[J]. Геология рудных месторождений, 1991, (2): 15~24.
[11]	Cameron E M, Hattori K. Archean gold mineralization and oxidized hydrothermal fluids[J]. Ecology Geology, 1987, 82(5): 1177~1191. doi: 10.2113/gsecongeo.82.5.1177
[12]	Cameron E M. Derivation of gold by oxidative metamorphism of a deep ductile shear zone: part 1. conceptual model[J]. Journal of Geochemical Exploration, 1989, 31: 135~147. doi: 10.1016/0375-6742(89)90003-4
[13]	Newton R C. Fluids and shear zones in the deep crust[J]. Tectophysics, 1990, 182: 21~27. doi: 10.1016/0040-1951(90)90339-A
[14]	Nesbitt B E, Murowchick J R, Muhlenbachs K. Dualo rigins of lodegold deposits in the Canadian Cardillera[J]. Geology, 1986, 14: 501~509.
[15]	邓军, 翟裕生, 杨立强, 等. 构造演化与成矿系统动力学[J]. 地学前缘, 1999, 6(2):315~323. doi: 10.3321/j.issn:1005-2321.1999.02.010