Topic
Terrane
About: Terrane is a research topic. Over the lifetime, 11025 publications have been published within this topic receiving 442596 citations. The topic is also known as: tectonostratigraphic terrane.
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TL;DR: The high-P, medium-T Pouebo terrane of the Pam Peninsula, northern New Caledonia includes barroisite-and glaucophane-bearing eclogite and variably rehydrated equivalents as discussed by the authors.
Abstract: The high-P, medium-T Pouebo terrane of the Pam Peninsula, northern New Caledonia includes barroisite- and glaucophane-bearing eclogite and variably rehydrated equivalents. The metamorphic evolution of the Pouebo terrane is inferred from calculated P–T and P–T –XH2O pseudosections for bulk compositions appropriate to these rocks in the model system CaO–Na2O–FeO–MgO–Al2O3–SiO2–H2O. The eclogites experienced a clockwise P–T path that reached P≈19 kbar and T ≈600 °C. The eclogitic mineral assemblages are preserved because reaction consequent upon decompression consumed the rocks’ fluid. Extensive reaction occurred only in rocks with fluid influx during decompression of the Pouebo terrane.
172 citations
TL;DR: Recon reconstructions are only compatible with geodynamic models involving an initial collision of India with a near-equatorial Trans-Tethyan subduction system at ~60 Ma, followed by a later collision with the Asian margin.
Abstract: Convergence between the Indian and Asian plates has reshaped large parts of Asia, changing regional climate and biodiversity, yet geodynamic models fundamentally diverge on how convergence was accommodated since the India–Asia collision. Here we report palaeomagnetic data from the Burma Terrane, which is at the eastern edge of the collision zone and is famous for its Cretaceous amber biota, to better determine the evolution of the India–Asia collision. The Burma Terrane was part of a Trans-Tethyan island arc and stood at a near-equatorial southern latitude at ~95 Ma, suggesting island endemism for the Burmese amber biota. The Burma Terrane underwent significant clockwise rotation between ~80 and 50 Ma, causing its subduction margin to become hyper-oblique. Subsequently, it was translated northward on the Indian Plate by an exceptional distance of at least 2,000 km along a dextral strike-slip fault system in the east. Our reconstructions are only compatible with geodynamic models involving an initial collision of India with a near-equatorial Trans-Tethyan subduction system at ~60 Ma, followed by a later collision with the Asian margin. The Burma Terrane was part of a Trans-Tethyan island arc that began to collide with India 60 million years ago, according to palaeomagnetic data.
172 citations
TL;DR: The Braziliano I Orogeny as discussed by the authors is a superposed orogenic system of Southeastern Brazil, which was active during the Brasiliano-Pan-African Cycle during the assembly of this sector of the Gondwana Supercontinent, including distinct terranes such as the Guanhaes, Curitiba, Apiai-Guaxupe and Serra do Mar microplates and the Juiz de Fora Thrust Belt.
171 citations
TL;DR: More than 420 million oz of gold were concentrated in circum-Pacific synorogenic quartz lodes mainly during two periods of continental growth, one along the Gondwanan margin in the Palaeozoic and the other in the northern Pacific basin between 170 and 50 Ma.
171 citations
TL;DR: In this article, the ages and paleogeographic affinities of basement rocks of Tibetan terranes are poorly known, and the Amdo basement is exposed within the Bangong suture zone between the Lhasa and Qiangtang terrans.
171 citations