It represents a neoproterozoic back-arc

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Neoproterozoic glaciation in the mid-oceanic realm: An ...

Neoproterozoic glaciation in the mid-oceanic realm: An example from hemi-pelagic mudstones on Llanddwyn Island, Anglesey, UK ... dropstones associated with extensive tillites reported in shallow marine sequences of continental shelf facies and in back-arc basins.

Depositional and Diagenetic History of the Neoproterozoic ...

Depositional and Diagenetic History of the Neoproterozoic Silicified Stromatolitic Carbonates, West of Wadi Girshah, Ablah District, Western Arabian Shield, Saudi ... represent a back arc situation of restricted starved and isolated marine environments of low volcaniclastic input.

Evolution of the Neoproterozoic rift basins and its ...

It represents the exact development time of the rift basin. The rift magmatism and strata data indicate that the southern and northern Tarim have different basin initiation time. ... The evolutionary process of the Neoproterozoic back-arc rift and South Tianshan oceanic basins in the northern Tarim is similar to that of the Late Mesozoic to ...

Whole rock geochemistry, Zircon U-Pb and Hf isotope ...

which represents anarcback-arc complex of MiddleJurassicage.The Çangaldağ Pluton consists mainlyofnon- ... the IstanbulZonguldak Terrane (IZT), which represents the southern Eurasian margin. It is separated from the Sakarya Composite Terrane ... interpreted as remobilized Late Neoproterozoic and Hercynian base-ment of the Central ...

back-arc area - English-French Dictionary - Glosbe

The Neoproterozoic sediments, hosting the Pola de Allande granitoids and present in large areas of northwest Iberia, may represent the back-arc basin of the subduction complex in which the Avalon composite terrane constituted the main magmatic arc.

From Cadomian arc to Ordovician passive margin ...

gen and detritus deposition in the back-arc basin. The very ... composed of neoproterozoic basement intruded by latest ... (MF) most probably represents sedimentary infill of a back-arc basin developed between the Cadomian arc and the Gondwana passive margin (PM). The younger SF deposited

Mid-Neoproterozoic (ca. 830800 Ma) metamorphic P-T paths ...

tinental arc-back-arc rifting setting based on the dominance of calc-alkaline granitoids and the conspicuous arc-like geochemical features of the mafic rocks. Neoproterozoic regional metamorphism and deformati on are well documented in the Aksu area, northwestern

Late Neoproterozoic arc-related magmatism in the Horse ...

The HCC represents the last-known period of Neoproterozoic subduction zone related magmatism on the northeastern Avalon Peninsula. It is envisaged as a major dyke swarm, possibly controlled by the orientation of a Proterozoic Topsail Fault related system.

Abstract - Harvard University

The Santa Terezinha sequence represents a back-arc basin that received input from the Neoproterozoic Goiás magmatic arc to the west and the São Francisco ancient continental margin to the east. The basal and upper sections of this sequence correlate, respectively, with other passive margin and back-arc sequences of the Brası´lia belt.

Chapter 1 The geological record of Neoproterozoic ice ages ...

The IUGS- and UNESCO-funded International Geoscience Programme Project #512 (Neoproterozoic Ice Ages) was conceived to contribute towards a global synthesis of current geological data on the number, duration, extent, causes and consequences of glacial episodes during the Neoproterozoic Era.

Formation process of mid-Neoproterozoic mafic rocks from ...

ABSTRACTThe mid-Neoproterozoic tectonic setting of the Jiangnan Orogen (JO) is uncertain due to the ongoing debate regarding the history of interactions between the Yangtze and Cathaysia Blocks. Extensive magmatic rocks with ages >830 Ma are observed in the eastern JO and are reported to indicate their formation conditions; however, such magmatic rocks are rare in the western JO.

Geochemical constraints from the Hafafit Metamorphic ...

Geochemical constraints from the Hafafit Metamorphic Complex (HMC): Evidence of Neoproterozoic back-arc basin development in the central Eastern Desert of Egypt H. Abd El-Naby a,b,*, W. Frisch b a Nuclear Materials Authority, ... Hafafit area represents one of three major domal struc-tures on the Eastern Desert of Egypt (Fig. 1, inset): Abu ...

HKU Scholars Hub: The Yanbian Terrane (Southern Sichuan ...

The Yanbian Terrane represents a typical arc assemblage formed on the western edge of the Yangtze Block during Neoproterozoic time. The sedimentary sequence was deposited in an oceanic setting, probably in a back arc basin environment.

Geology and metallogeny of the Ar Rayn terrane, eastern ...

The Neoproterozoic Ar Rayn terrane is exposed along the eastern margin of the Arabian shield. The terrane is bounded on the west by the Ad Dawadimi terrane across the Al Amar fault zone (AAF), and is nonconformably overlain on the east by Phanerozoic sedimentary rocks. The terrane is composed of a magmatic arc complex and syn- to post-orogenic intrusions.

The late Neoproterozoic Frog Lake hornblende gabbro pluton ...

The late Neoproterozoic Frog Lake pluton, in the Avalon terrane of the Cobequid Highlands, Nova Scotia, consists predominantly of hornblende gabbro. It shows petrographic similarities to water-rich mafic intrusions known as appinites that are present in some collisional orogens. This study aims to further understanding of the origin of appinitic intrusions.

Stratigraphic and UPb SHRIMP Detrital Zircon Evidence for ...

The tectonic provenance of Neoproterozoic volcanism and sedimentation within the South China Block (the combined Yangtze and Cathaysian Cratons) is a matter of controversy with direct bearing on Rodinia reconstruction models.

Geochemistry and geothermobarometry of the Um Eleiga ...

Um Eleiga Neoproterozoic island arc intrusive complex, SE Egypt: genesis of a potential ... of back arc basins to assemble a continental shield during the period between 900 and 550 Ma. 3,41,65,70 The ... suite represents a part of the voluminous plutonic,

The Neoproterozoic Geology of the Tarim Craton

The Neoproterozoic Geology of the Tarim Craton ... geological record of back-arc basin subduction (Lu et al. 2006). Based on these ... and previous paleomagnetic data, Zhang et al. (2012) believed that the Tarim Movement represents the tectonic process of the Tarim craton being accreted to the northern margin of Australia and becoming part of ...

Neoproterozoic arc-back-arc system in the Central Eastern ...

Abstract Ophiolites are widely distributed in the Central Eastern Desert (CED) of Egypt, occurring as clusters in the northern (NCEDO) and southern (SCEDO) segments.

Carolina terrane - Wikipedia

The Carolina Terrane, also called the Carolina Superterrane or Carolinia, is an exotic terrane running ~600 km approximately North-South from central Georgia to central ia in the United States. It constitutes a major part of the eastern Piedmont Province .

Ultramafic rock - Wikipedia

Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% Mg O, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark colored, high magnesium and iron content). The Earth's mantle is composed of ultramafic rocks.

Deformational History of the Neoproterozoic Keraf Zone in ...

ARTICLES Deformational History of the Neoproterozoic Keraf Zone in NE Sudan, Revealed by Shuttle Imaging Radar' Mohamed G. Abdelsalam, Robert J. Stern, Heinz Schandelmeier,2

Geology of Norway - Wikipedia

The geology of Norway encompasses the history of earth that can be interpreted by ... The uppermost part of the Neoproterozoic sequence throughout Norway ... vertically stacked sequence thus represents the passive margins of Baltica and Laurentia and intervening island arcs and back-arc basins telescoped together and emplaced on top ...

Geochemical constraints from the Hafafit Metamorphic ...

Geochemical constraints from the Hafafit Metamorphic Complex (HMC): Evidence of Neoproterozoic back-arc basin development in the central Eastern Desert of Egypt ... Sedimentation may have occurred in a back-arc basin setting with transitional deposition from shallow-marine to terrestrial environment. ... The Hafafit area represents one of the ...

Orogen styles in the East African Orogen: A review of the ...

The East African Orogen, extending from southern Israel, Sinai and Jordan in the north to Mozambique and Madagascar in the south, is the worl d ́ s largest Neoproterozoic to Cambrian orogenic complex. It comprises a collage of individual oceanic domains and continental fragments between the Archean SaharaCongoKalahari Cratons in the west and Neoproterozoic India in the east.

American Journal of Science, Vol. , April, 413448, DOI 10 ...

The Nashoba terrane therefore represents a Gande-rian arc/back-arc complex similar to the Cambrian Penobscot arc/back-arc seen in ... [American Journal of Science, Vol. 317, April, 2017,P.413448, DOI 10.2475/04.2017.01] ... From the Neoproterozoic until the late Paleozoic, Laurentia was separated from

A lost arcback-arc terrane of the Dunnage oceanic tract ...

represents peri-Laurentian continental arc magmas coeval with the Red Indian Lake ... with initiation of a back-arc basin, possibly on the Laurentian margin. (3) Mafi c-inter- ... Neoproterozoic to Upper Ordovician rocks of the Humber and Dunnage zones (Figs. 1 and 2). ...

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