Geochemistry, zircon UPb geochronology and LuHf isotopic composition of eclogites and their host gneisses in the Dulan area, North Qaidam UHP terrane: New evidence for deep continental subduction

With the recognition of the Hope Valley shear zone (HVSZ) as a terrane boundary, the Esmond-Dedham terrane (EDT) was subdivided, and the western division was named the Hope Valley terrane (HVT). The oldest rocks of the HVT consist of schist, gneiss and quartzite (Plainfield Formation), and metavolcanic and metaplutonic gneisses and amphibolites (Waterford Group), some of the latter yielding a radiometric age of 620 Ma. Members of the Sterling Plutonic Suite, consisting of granite gneiss and alaskite gneiss, intrude these older units. An exact radiometric age could not be determined for the alkaline pluton, Joshua Rock Granite Gneiss, but is...

Radiometric dating

10.1130/spe245-p13

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Citations (27)

Origin of eclogites from South Brittany, France: A SmNd isotopic and REE study

Chemical Geology Isotope Geoscience section (1985)

J. Bernard-Griffiths J. Cornichet

Protolith

Massif

10.1016/0168-9622(85)90017-x

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Citations (59)

Protolith age of eclogites from the southern part of Pezhostrov Island, Belomorian belt: Protolith of metabasites as indicator of eclogitization time

Petrology (2016)

С. Г. Скублов А. В. Березин А. Е. Мельник B. Yu. Astafiev О. А. Воинова

Protolith

10.1134/s0869591116040056

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Citations (18)

Geochemistry of the eclogites of the Maksyutov Complex, South Urals, and genetic nature of their protoliths

Geochemistry International (2015)

С. Г. Ковалев Е. А. Тимофеева E. O. Pindyurina

Protolith

Phengite

10.1134/s0016702915040047

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Research on protolith of eclogite in main hole of Chinese Continental Scientific Drill project and its genetic instructions

The Journal of Geology (2013)

Jian Hu

Eclogite was the most common metamorphic rock in orogenic belt, it contained abundant geodynamic information. According to the contact relationship of country rocks, the eclogite from 0~2 000 m in the main hole of the Chinese Continental Scientific Drill (CCSD) could be classified into three types: symbiotic eclogite gneiss;eclogite adjacent to ultrabasic rocks and symbiotic eclogite ultrabasic rocks. Compared to the geochemical differences with the three types of eclogites, the authors considered that the protoliths of these rocks were probably the basic-untrabasic complex evolved from the single magma chamber by cumulation and fractional crystallization. The main source materials of these protoliths were derived from the enriched mantle by partial melting in subduction zone of oceanic crust downthrusted to the mainland under a back-arc extensional magmatism.

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Ultramafic rock

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