Postsubduction porphyry Cu-Au and epithermal Au deposits: Products of remelting of subduction-modified lithosphere

Geology ◽  
2009 ◽  
Vol 37 (3) ◽  
pp. 247-250 ◽  
Author(s):  
Jeremy P. Richards
Keyword(s):  
Porphyry Cu ◽  
Epithermal Au

Asynchronous formation of the adjacent epithermal Au-Cu and porphyry Cu-Mo deposits in the Zijinshan orefield, southeast China

2018 ◽  
Vol 102 ◽  
pp. 351-367 ◽  
Author(s):  
Wenting Huang ◽  
Huaying Liang ◽  
Lei Wu ◽  
Jing Wu ◽  
Jing Li ◽  
...  
Keyword(s):  
Southeast China ◽  
Porphyry Cu ◽  
Epithermal Au

scholarly journals Paleozoic Epithermal Au and Porphyry Cu Deposits in North Xinjiang, China: Epochs, Features, Tectonic Linkage and Exploration Significance

2002 ◽  
Vol 52 (4) ◽  
pp. 291-300 ◽  
Author(s):  
Kezhang Qin ◽  
Shu Sun ◽  
Jiliang Li ◽  
Tonghui Fang ◽  
Shulai Wang ◽  
...  
Keyword(s):  
Porphyry Cu ◽  
North Xinjiang ◽  
Epithermal Au

scholarly journals Hydrothermal Alteration and Mineralization of the Randu Kuning Porphyry Cu-Au and Intermediate Sulphidation Epithermal Au-Base Metals Deposits in Selogiri, Central Java, Indonesia

2016 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Sutarto Sutarto ◽  
Arifudin Idrus ◽  
Agung Harijoko ◽  
Lucas Donny Setijadji ◽  
Franz Michael Meyer ◽  
...  
Keyword(s):  
Hydrothermal Alteration ◽  
Carbonate Rocks ◽  
Base Metals ◽  
Porphyry Cu ◽  
Central Java ◽  
Copper Gold ◽  
Volcaniclastic Rocks ◽  
Gold Grade ◽  
Epithermal Au ◽  
Yogyakarta City

The Randu Kuning Porphyry Cu-Au prospect area is situated in the Selogiri district, Wonogiri regency, Central Java, Indonesia, about 40 km to the South-East from Solo city, or approximately 70 km east of Yogyakarta city. The Randu Kuning area and its vicinity is a part of the East Java Southern Mountain Zone, mostly occupied by both plutonic and volcanic igneous rocks, volcaniclastic, silisiclastic and carbonate rocks. Magmatism-volcanism products were indicated by the abundant of igneous and volcaniclastic rocks of Mandalika and Semilir Formation. The Alteration zones distribution are generally controlled by the NE–SW and NW–SE trending structures. At least eight types of hydrothermal alteration at the Randu Kuning area and its vicinity had been identified, i.e. magnetite + biotite ± K-feldspar ± chlorite (potassic), chlorite + sericite + magnetite ± actinolite, chlorite + magnetite ± actinolite ± carbonate (inner propylitic), chlorite + epidote ± carbonate (outer propylitic), sericite + quartz + pyrite (phyllic), illite + kaolinite ± smectite (intermediate argillic), illite + kaolinite ± pyrophyllite ± alunite (advanced argillic) and quatz + chlorite (sillisic) zones. The Randu Kuning mineralization at Selogiri is co existing with the porphyry Cu-Au and intermediate sulphidation epithermal Au-base metals. Mineralization in the porphyry environment is mostly associated with the present of quartz-sulphides veins including AB, C, carbonate-sulphides veins (D vein) as well as disseminated sulphides. While in the epithermal prospect, mineralization is particularly associated with pyrite + sphalerite + chalcopyrite + carbonate ± galena veins as well as hydrothermal breccias. The Randu Kuning porphyry prospect has copper gold grade in range at about 0.66–5.7 gr/t Au and 0.04–1.24 % Cu, whereas in the intermediate sulphidation epithermal contain around 0.1–20.8 gr/t Au, 1.2–28.1 gr/t Ag, 0.05–0.9 % Zn, 0.14–0.59 % Pb and 0.01–0.65 % Cu.

Cenozoic Strike-Slip Tectonics and Structural Controls of Porphyry Cu-Mo and Epithermal Deposits During Geodynamic Evolution of the Southernmost Lesser Caucasus, Tethyan Metallogenic Belt

2019 ◽  
Vol 114 (7) ◽  
pp. 1301-1337 ◽  
Author(s):  
Samvel Hovakimyan ◽  
Robert Moritz ◽  
Rodrik Tayan ◽  
Rafael Melkonyan ◽  
Marianna Harutyunyan
Keyword(s):  
Base Metal ◽  
Strike Slip ◽  
Early Miocene ◽  
Tectonic Plate ◽  
Porphyry Cu ◽  
Metallogenic Belt ◽  
Late Neogene ◽  
Lesser Caucasus ◽  
Dextral Strike Slip ◽  
Epithermal Au

Abstract The Zangezur-Ordubad mining district of the southernmost Lesser Caucasus is located in the central segment of the Tethyan metallogenic belt and consists of porphyry Cu-Mo and epithermal Au and base metal systems hosted by the composite Cenozoic Meghri-Ordubad pluton. Ore-hosting structures and magmatic intrusions are predominantly confined to a central N-S–oriented corridor 40 km long and 10 to 12 km wide, located between two regional NNW-oriented right-lateral faults, the Khustup-Giratagh and Salvard-Ordubad faults. The anatomy and kinematics of the main fault network are consistent with dextral strike-slip tectonics controlled by the NNW-oriented Khustup-Giratagh and Salvard-Ordubad faults. Dextral strike-slip tectonics was initiated during the Eocene, concomitantly with final subduction of the Neotethys, and controlled the emplacement of the Agarak, Hanqasar, Aygedzor, and Dastakert porphyry Cu-Mo and Tey-Lichkvaz and Terterasar epithermal Au and base metal deposits. The Eocene structures were repeatedly reactivated during subsequent Neogene evolution in transition to a postsubduction geodynamic setting. Ore-bearing structures at the Oligocene world-class Kadjaran porphyry Cu-Mo deposit were also controlled by dextral strike-slip tectonics, as well as porphyry mineralization and its epithermal overprint hosted by an early Miocene intrusion at Lichk. Eocene to early Miocene dextral strike-slip tectonics took place during NE- to NNE-oriented compression related to Paleogene Eurasia-Arabia convergence and subsequent Neogene postcollision evolution. Paleostress reconstruction indicates major reorganization of tectonic plate kinematics since the early Miocene, resulting in N-S– to NW-oriented compression. Early Miocene epithermal overprint at the Kadjaran porphyry deposit and left-lateral reactivation of faults and mineralized structures are linked to this late Neogene tectonic plate reorganization.

1-1: Porphyry Cu–Au and epithermal Au–Ag deposits in the southern Apuseni Mountains, Romania

2005 ◽  
Vol 27 (1-4) ◽  
pp. 46-47 ◽  
Author(s):  
K. Kouzmanov ◽  
P. Ivăşcanu ◽  
G. O'Connor
Keyword(s):  
Apuseni Mountains ◽  
Porphyry Cu ◽  
Epithermal Au

scholarly journals Zircon U-Pb, Molybdenite Re-Os and Quartz Vein Rb-Sr Geochronology of the Luobuzhen Au-Ag and Hongshan Cu Deposits, Tibet, China: Implications for the Oligocene-Miocene Porphyry–Epithermal Metallogenic System

Minerals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 476
Author(s):  
Hanxiao Huang ◽  
Hong Liu ◽  
Guangming Li ◽  
Linkui Zhang ◽  
Huawen Cao ◽  
...  
Keyword(s):  
Quartz Vein ◽  
Porphyry Copper ◽  
Western China ◽  
Geochronological Data ◽  
Porphyry Cu ◽  
Metallogenic Belt ◽  
Granodiorite Porphyry ◽  
Epithermal Au ◽  
New Discovery ◽  
Metallogenic System

The Gangdese metallogenic belt in Tibet is an important copper and iron polymetallic, metallogenic belt in western China. The Luobuzhen epithermal Au-Ag and Hongshan porphyry Cu deposits, as two new discovery deposits in the last few years, are located in the western Gangdese metallogenic belt. In this paper, we present quartz vein Rb-Sr isochron, zircon U-Pb and molybdenite Re-Os ages for a better understanding of the minerallogenetic epoch of the deposits. Geochronological data show that the Rb-Sr isochron age of a quartz vein in a Luobuzhen Au-Ag deposit is 21.1 ± 1.8 Ma (MSWD (mean standard weighted deviation) = 0.19), zircon U-Pb ages from diorite and granodiorite porphyry in Hongshan Cu deposit are 50.0 ± 0.4 Ma (MSWD = 0.94) and 23.7 ± 0.1 Ma (MSWD = 0.73), respectively, and a Re-Os isochron age of molybdenite in Hongshan Cu deposit is 23.0 ± 2.0 Ma (MSWD = 0.014). These data suggest that the Luobuzhen epithermal Au-Ag and Hongshan porphyry Cu deposits formed at ca. 23–21 Ma, which were controlled by the same magmatic hydrothermal events. Formation of both the Luobuzhen and Hongshan deposits were obviously earlier than the Miocene porphyry metallogenetic events in the Gangdese porphyry copper belt.

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