Ductile shear deformation and gold mineralization in the Hetai goldfield of the Yunkai Massif, South China Block

2019 ◽  
Vol 54 (2) ◽  
pp. 929-945
Author(s):  
Jinlong Ni ◽  
Junlai Liu ◽  
Jingcao Wang ◽  
Xiaoling Tang ◽  
Zhong Wang ◽  
...  
Keyword(s):  
Shear Deformation ◽  
South China ◽  
Gold Mineralization ◽  
South China Block ◽  
Ductile Shear ◽  
Ductile Shear Deformation

Application Of Electron Probe Analyses Of Minerals In Discussing The Relationship Between Ductile Deformation And Metamorphism

1990 ◽  
Vol 48 (2) ◽  
pp. 250-251
Author(s):  
Fan Guochuan ◽  
Sun Zhongshi
Keyword(s):  
Chemical Composition ◽  
Shear Deformation ◽  
Electron Probe ◽  
General Rule ◽  
Granulite Facies ◽  
Ductile Deformation ◽  
Higher Temperature ◽  
Ductile Shear ◽  
The Relationship ◽  
Ductile Shear Deformation

Under influence of ductile shear deformation, granulite facies mineral paragenesis underwent metamorphism and changes in chemical composition. The present paper discusses some changes in chemical composition of garnet in hypers thene_absent felsic gnesiss and of hypersthene in rock in early and late granulite facies undergone increasing ductile shear deformation .In garnet fetsic geniss, band structures were formed because of partial melting and resulted in zoning from massive⟶transitional⟶melanocrate zones in increasing deformed sequence. The electron-probe analyses for garnet in these zones are listed in table 1 . The Table shows that Mno, Cao contents in garnet decrease swiftly from slightly to intensely deformed zones.In slightly and moderately deformed zones, Mgo contents keep unchanged and Feo is slightly lower. In intensely deformed zone, Mgo contents increase, indicating a higher temperature. This is in accord with the general rule that Mgo contents in garnet increase with rising temperature.

scholarly journals Ductile shear deformation of the Sambagawa metamorphic rocks in the Kanto Mountains.

2001 ◽  
Vol 107 (5) ◽  
pp. 337-353 ◽  
Author(s):  
Tatsumi Abe ◽  
Hideo Takagi ◽  
Koji Shimada ◽  
Shinji Kimura ◽  
Keisuke Ikeyama ◽  
...  
Keyword(s):  
Shear Deformation ◽  
Metamorphic Rocks ◽  
Ductile Shear ◽  
Ductile Shear Deformation

Chapter 35: Gold Deposits of the Jiaodong Peninsula, Eastern China

2020 ◽  
pp. 753-774
Author(s):  
Kun-Feng Qiu ◽  
Richard J. Goldfarb ◽  
Jun Deng ◽  
Hao-Cheng Yu ◽  
Zong-Yang Gou ◽  
...  
Keyword(s):  
South China ◽  
North China ◽  
Gold Mineralization ◽  
Eastern China ◽  
Gold Deposits ◽  
Fault System ◽  
South China Block ◽  
North China Block ◽  
The North ◽  
Basement Rocks

Abstract The Jiaodong gold province, within the eastern margin of the North China block and the translated northeastern edge of the South China block, has a stated premining gold resource exceeding 4,500 metric tons (t). It is thus one of the world’s largest gold provinces, with a present cumulative annual production estimated at 60 t Au. More than 90% of the Jiaodong gold resource is hosted by batholiths and related bodies of the Linglong (ca. 160–145 Ma) and, to a lesser degree, Guojialing (ca. 130–122 Ma) suites. The intrusions were emplaced into high-grade metamorphic basement rocks of the Precambrian Jiaobei (North China block) and Sulu (South China block) terranes during a 70-m.y.-period of lithospheric delamination, extensional core complex formation, and exhumation. The deposits are located about 20 to 200 km to the east of the continental-scale NNE-striking Tancheng-Lujiang (Tan-Lu) strike-slip fault system. They occur along a series of more regional NNE- to NE-striking brittle and ductile-brittle faults, which appear to intersect the Tan-Lu main structure to the southwest. This system of early to middle Mesozoic regional thrust faults, reactivated during Cretaceous normal motion and ore formation, tends to occur along the margins of the main Linglong batholiths or between intrusions of the two suites of granitoids. Orebodies are mainly present as quartz-pyrite veins (Linglong-type) and as stockwork veinlets and disseminated mineralization (Jiaojia-type). The two mineralization styles are transitional and may be present within the same gold deposit. The ca. 120 Ma timing of gold mineralization correlates with major changes in plate kinematics in the Pacific Basin and the onset of seismicity along the Tan-Lu fault system, with the enormous fluid volumes and associated metal being derived from sediment devolatilization above the westerly subducting Izanagi slab.

Sign in / Sign up

Export Citation Format

Share Document