Regional geochemical reconnaissance of the Cordillera Occidental of Ecuador: economic and environmental applications
Thomas M. WilliamsP. N. DunkleyEdgar Gómez CruzVictor AcitimbayAlina GaiborEdgar LopezNapoleon BaezJ. A. Aspden
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Continental Margin
Several narrow terranes occur along the Denali fault in the Eastern and Central Alaska Range in Southern Alaska. These terranes are the Aurora Peak, Cottonwood Creek, Maclaren, Pingston, and Windy terranes, and a terrane of ultramafic and associated rocks. Exterior to the narrow terranes to the south is the major Wrangellia island arc composite terrane, and to the north is the major Yukon-Tanana metamorphosed continental margin terrane. Overlying mainly the northern margin of the Wrangellia composite terrane are the Kahiltna overlap assemblage to the west, and the Gravina-Nutzotin-Gambier volcanic-plutonic-sedimentary belt to the east and southeast. The various narrow terranes are...
North American Plate
Continental Margin
Ultramafic rock
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A widely accepted definition of tectonostratigraphic terrane is that of Howell, Jones, and Schermer (1985): a fault-bounded package of rocks of regional extent characterized by a geologic history that differs from that of neighboring terranes. The word terrane has, of course, a very long history of use in non-specific contexts in geological literature.
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Devonian
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Based on the great thickness crustal struture and complex geophysical character,this paper points out the principle for dividing terranes in Qinghai─Xizang Plateau according to earthquake activities and wave field sign,lithospheric structure and velocity character,palemagnetic mark,potential field sign ,temperature sign, geological and tectonics character. From north to south of the Qinghai─Xizang Plateau and its neighbouring regions can be devided in seven terranes, ie, Qaidam terrane, Kunlun terrane, Hon Xil-Bayan Har terrane, Qangtang terrane, Lhasa-Gangdise terrane, Himalayan terrane and Ganges Plain terrane. The distribution and character of these terranes have important rools for the studies of the formation and evolution.of the plateau and plate movement and dynamic mechanism.
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Based on abundant geological data,this paper divides geologically Fujian province into four distinct terranes,namely,Northwest Fujian terrane,Southwest Fujian terrane,East Fujian terrane and Southeast Fujian terrane,and correlates their geological features in detail respectively.Through the study on collision-amalgamation history of each terrrane,it can be concluded that they mainly underwent three stages:(1)in Late Proterozoic,the Southwest Fujian terrane and Northwest Fujian terrane collided and amalgamated along the Nanping-Ninghua fracture zone,being accompanied by submarine and continental volcanic eruptions;(2)in Triassic,the East Fujian terrane collided and amalgamated with the Southwest Fujian terrane and Northwest Fujian terrane along the Zhenghe-Dapu fracture belt,and the Southeast Fujian terrane amalgamated simultaneously with the East Fujian terrane;(3)in Cretaceous,the Southwest Fujian terrane underwent a left-lateral strike slip along the Pingtan-Dongshan fracture zone.
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Radiogenic nuclide
Island arc
Back-arc basin
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Abstract The Chrystalls Beach‐Brighton coastal block in southeast Otago has commonly has been placed in Caples Terrane, but has recently been described as a geochemically anomalous area of uncertain terrane affinity. Data points on discriminant diagrams occupy fields centred between those for type Caples Group and Torlesse Terrane, overlapping both. The psammites average 71.9% SiO2, closely comparable to Torlesse Terrane psammites, in contrast to the majority of type Caples Group psammites (av. 64.3%) and Waipapa Terrane psammites (64.4%). QFL plots show the Chrystalls Beach psammites as a petrofacies distinct from those described hitherto for Torlesse Terrane (lithic feldsarenites) and Caples Group and Murihiku Terrane (volcarenites). Keywords: Caples TerraneTorlesse TerraneChrystalls Beach ComplexMurihiku TerranegeochemistryOtago SchistWaipapa Terrane
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In southern Alaska, multiple terranes—slabs that have broken off from larger tectonic plates and shuffed around—create a complex patchwork that makes it challenging for scientists to untangle the tectonic history and structure of the region. One of these, the Yakutat terrane, which lies just offshore southern Alaska in the Gulf of Alaska, is converging with the North American plate and driving the growth of the Chugach–St. Elias mountains. The structure of this terrane has not been well studied until now. Worthington et al. conducted seismic studies to create a two‐ dimensional seismic velocity model of the Yakutat terrane. The model allows them to constrain the crustal thickness and composition of the terrane.
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Continental Margin
Passive margin
Convergent boundary
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