Ophiolitic source rocks for Taconic-age flysch: Trace-element evidence

Hiscott, Richard N.

doi:10.1130/0016-7606(1984)95<1261:osrftf>2.0.co;2

Cited by 203 publications

(103 citation statements)

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“…The Y/Ni ratios monitor the content of ferromagnesian trace elements compared with a proxy for HREE. The ultramafic rocks have higher Cr/V and lower Y/Ni ratios (Hiscott 1984;McLennan et al 1993; …”

Section: Trace Element Geochemistrymentioning

confidence: 99%

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

Francírek¹,

Nehyba²

2016

Geologica Carpathica

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Abstract:The Karpatian deposits of the central part of the Carpathian Foredeep in Moravia, which are deeply buried under the Outer Western Carpathians, provide a unique opportunity to reconstruct the former evolutionary stages of this peripheral foreland basin and its paleogeography. A succession of three depositional units characterized by a distinct depositional environment, provenance, and partly also foreland basin depozone, have been identified. The first depositional unit represents a proximal forebulge depozone and consists of lagoon-estuary and barred coastline deposits. The source from the "local" crystalline basement played here an important role. The second depositional unit consists of coastline to shallow marine deposits and is interpreted as a forebulge depozone. Tidalites recognized within this unit represent the only described tide-generated deposits of the Neogene infill of the Carpathian Foredeep basin in Moravia. The source from the basin passive margin (the Bohemian Massif) has been proved. The third depositional unit is formed by offshore deposits and represents a foredeep depozone. The provenance from both passive and active basin margin (Silesian Unit of the Western Carpathian Flysch Zone) has been proved. Thus, both a stepwise migration of the foredeep basin axis and shift of basin depozones outwards/cratonwards were documented, together with forebulge retreat. The shift of the foreland basin depozones more than 50 km cratonward can be assumed. The renewed thrusting along the basin's active margin finally completely changed the basin shape and paleogeography. The upper part of the infill was deformed outside the prograding thrust front of flysch nappes and the flysch rocks together with a strip of Miocene sediments were superposed onto the inner part of the basin. The width and bathymetric gradient of the entire basin was changed/reduced and the deposition continued toward the platform. The basin evolution and changes in its geometry are interpreted as a consequence of the phases of the thrust-sheet stacking and sediment loading in combination with sealevel change.

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Section: Trace Element Geochemistrymentioning

confidence: 99%

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

Francírek¹,

Nehyba²

2016

Geologica Carpathica

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“…The high Cr/V ratio may indicate that the influence of diagenetic factors as a result of anoxic bottom-water conditions during deposition was not significant enough to enrich the vanadium. Y/Ni ratios in the flysch and molasse are low which confirms that the mafic and ultramafic rocks were abundantly present in the source area of the Nam Duk Formation 29 . Chondrite normalized REE and trace elements abundance patterns of pelagic, flysch, and molasse samples are compared with the sedimentary composition standard as shown in Table 1.…”

Section: Trace Elementsmentioning

confidence: 50%

“…As for flysch and molasse sequences, sandstones and shales are more prominent and are used for trace elements analysis. Cr/V ratios of flysch and molasse samples are higher than 1 which indicates the presence of chromite among the heavy mineral during deposition 29 . The high Cr/V ratio may indicate that the influence of diagenetic factors as a result of anoxic bottom-water conditions during deposition was not significant enough to enrich the vanadium.…”

Section: Trace Elementsmentioning

confidence: 99%

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Malila¹,

Chonglakmani²,

Feng³

et al. 2008

ScienceAsia

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ABSTRACT:The Permain Nam Duk Basin is a part of the Phetchabun Fold Belt of central mainland Thailand. This basin is considered to be a geological backbone of tectonic evolution during the Late Paleozoic in Thailand. In this study, provenance analysis of the siliciclastic sediments of the Nam Duk Formation has been carried out based on geochemical and cathodoluminescence techniques. The geochemical result indicates that the siliciclastic sediment of Lower-Middle Permian "pelagic sequence" is a transitional deposit between an oceanic island arc and a continental island arc environments and is derived mainly from metabasic sources. During middle Middle to late Middle Permian, the provenance signatures of sandstones and shales from the "flysch" and the "molasse" sequences show indications of ultramafic-mafic igneous provenance and they were deposited in a continental island arc environment. The result supports the interpretation of NanUttaradit ophiolitic belt north-west of the Nam Duk Basin as a major terrane which supplied siliciclastic sediments to the Nam Duk Basin during Middle-Late Permian.

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“…Three lines of evidence can be used to recognize ophiolitic detritus in sedimentary rocks: (1) serpentinite fragments (Arai and Okada 1991;von Eynatten 2003), (2) anomalously high concentrations of Cr and Ni (Hiscott 1984;Garver and Scott 1995;Garver et al 1996;Totten et al 2000 and references therein), and (3) the oc- currence of Cr-spinels (Stevens 1970;Dick and Bullen 1984;Cookenboo et al 1997;Ganssloser 1999;Hisada et al 1999;Lee 1999).…”

Section: Discussionmentioning

confidence: 99%

From Subduction to Collision in the Northern Tibetan Plateau: Evidence from the Early Silurian Clastic Rocks, Northwestern China

Yang

Cawood³

et al. 2012

The Journal of Geology

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. The University of Chicago Press A B S T R A C TThe Qilian Orogen records early Paleozoic collisional suturing of the Qaidam Block and the Central Qilian Block to the North China Craton. The composition and U-Pb age of detrital zircons and the composition of Cr-spinels from the Early Silurian Lujiaogou and Angzanggou formations in the northern part of orogen indicate derivation from evolving oceanic and continental source terranes. Heavy-mineral chemistry indicates the incorporation of suprasubduction zone-type ophiolitic detritus in addition to continent-derived material. Integrating these chemical and age data with regional data on the duration of subduction-related magmatic activity, syn-and postcollisional granitic rocks, and high-pressure metamorphic rocks constrains the transformation from oceanic subduction to continental collision to 450-440 Ma. The collision resulted in a flood of detritus into the northern part of the orogen from the Central Qilian Block, which masked input from the intervening magmatic arc, implying rapid exposure of the block.

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Ophiolitic source rocks for Taconic-age flysch: Trace-element evidence

Cited by 203 publications

References 0 publications

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

Evolution of the passive margin of the peripheral foreland basin: an example from the Lower Miocene Carpathian Foredeep (Czech Republic)

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From Subduction to Collision in the Northern Tibetan Plateau: Evidence from the Early Silurian Clastic Rocks, Northwestern China

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