Search results
Results from the WOW.Com Content Network
An orogenic gold deposit is a type of hydrothermal mineral deposit. More than 75% of the gold recovered by humans through history belongs to the class of orogenic gold deposits. [ 1 ] Rock structure is the primary control of orogenic gold mineralization at all scales, as it controls both the transport and deposition processes of the mineralized ...
Ore genesis. High-grade gold ore from the Harvard Mine, Jamestown, California, a wide quartz -gold vein in California's Mother Lode. Specimen is 3.2 cm (1.3 in) wide. Various theories of ore genesis explain how the various types of mineral deposits form within Earth's crust. Ore-genesis theories vary depending on the mineral or commodity examined.
20–65 Ma. >65 Ma. Orogeny (/ ɒˈrɒdʒəni /) is a mountain - building process that takes place at a convergent plate margin when plate motion compresses the margin. An orogenic belt or orogen develops as the compressed plate crumples and is uplifted to form one or more mountain ranges.
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.
Classification. Iron oxide copper gold (IOCG) deposits are considered to be metasomatic expressions of large crustal-scale alteration events driven by intrusive activity. The deposit type was first recognised by discovery and study of the supergiant Olympic Dam copper-gold-uranium deposit (Olympic Dam mine), and South American examples.
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]
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 North China Craton covers an area of around 1.7x10 6 km 2 in northeastern China, Inner Mongolia, the Yellow Sea, and North Korea. Edited from Kusky, 2007 [1] and Zhao et al., 2005 [2] The location of the North China Craton in Asia. The North China Craton is a continental crustal block with one of Earth's most complete and complex records of ...