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A variety of gold deposits are formed in accretionary orogens, including orogenic gold deposits. [38] Orogenic gold deposits are typically located in metamorphosed fore-arc and back-arc regions, as well as in the arc [3] and show a close spatial relationship to lamprophyres and associated felsic porphyry dikes and sills. [39]
The majority of primary gold deposits fall into two main categories: lode gold deposits or intrusion-related deposits. Lode gold deposits, also referred to as orogenic gold are generally high-grade, thin, vein and fault hosted. They are primarily made up of quartz veins also known as lodes or reefs, which contain either native gold or gold ...
Appalachian Mountains are a well-studied orogenic belt resulting from a late Paleozoic collision between North America and Africa. Taconic orogeny – Mountain-building period that affected most of New England; Acadian orogeny – North American orogeny; Alleghanian orogeny – Mountain-forming event that formed the Appalachian and Allegheny ...
The term “orogenic” is used because these deposits likely form in accretionary and collisional orogens. [ 11 ] Transfer of weakly oxidized, low-salinity fluids to the sites of gold deposition is controlled by earthquake events, [ 12 ] allowing fluids to rapidly traverse large thicknesses of the crust.
Grenville orogenic crust of mid-late Mesoproterozoic age (c.1250—980 Ma) is found worldwide, but generally only events which occurred on the southern and eastern margins of Laurentia are recognized under the "Grenville" name. [1] These orogenic events are also known as the Kibaran orogeny in Africa and the Dalslandian orogeny in Western Europe.
The Laoshankou Iron Oxide-Cu-Au deposit, which is located at the southwest of the Qinhe City, Xinjian, Northwest China, is considered as one of the most important high-quality copper and gold reserve in the Central Asian Orogenic Belt, with the deposit being hosted by the volcanic rocks formed during Middle Devonian. [30]
Hatu is the name of a gold deposit and associated gold mines in the West Junggar region [1] [2] in Tuoli County [3] within the Xinjiang province of China. [4] It is the largest gold deposit in West Junggar and occurs in the Central Asian Orogenic Belt. [5] It is located less than one hour by road from Karamay. [4]
The early Carboniferous intrusive related gold deposits originate from a series of porphyries of granite, quartz-syenite, and tonalite. The ore from the intrusion deposited within the brittle ductile shear zone by magmatic fluids. The area of gold deposition from the intrusive body is small but the gold centration is significant. [1] [7] [5]