Geochemistry of metasediments from the Precambrian Hapschan Series, eastern Anabar Shield, Siberia

Condie, Kent C.; Wilks, M.; Rosen, D.M.; Zlobin, V. L.

doi:10.1016/0301-9268(91)90046-d

Cited by 46 publications

(14 citation statements)

References 22 publications

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“…Condie et al (1991) use the Cr and Ni concentrations of metagreywackes as indicators of a mafic source rock contribution to sedimentation. Condie et al (1991) use the Cr and Ni concentrations of metagreywackes as indicators of a mafic source rock contribution to sedimentation.…”

Section: Geochemical Classification and Provenancementioning

confidence: 99%

Tectonic implications from the geochemistry of Mfongosi Group metasediments, Natal Metamorphic Province, South Africa

Basson

Watkeys

2003

South African Journal of Geology

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The formation of the Mesoproterozoic Natal Metamorphic Province occurred during the closing stages of the assembly of the supercontinent Rodinia (~1150 to ~950 Ma), forming part of the ~1190 to ~950 Ma Grenvillian orogeny. This was preceded by the accretion, at ~1210 Ma, of Mesoproterozoic island arcs along the southern margin of the Archaean Kaapvaal Craton. The Mfongosi Group represents an enigmatic sequence of rocks found between the Kaapvaal Craton and the partially ophiolitic Natal Nappe Zone to the north of these accreted island arcs. Mfongosi metagreywackes adjacent to the Kaapvaal Craton have ocean island arc major element geochemical signatures. These contrast with metagreywackes approximately two kilometres further south, near the contact zone between the Natal Thrust Front and Natal Nappe Zone, which have active continental margin major element geochemical signatures. A third type of metasediment is represented in both areas by geochemically distinct low-Ca+Na, high-K meta-arkoses to meta-lithic arkoses, which were formed by relatively minor sedimentation from a passive continental margin. The Mfongosi Group is a fore-arc complex, incorporating elements of a fore-arc basin and an accretionary prism deposited in a trench, which filled during final oblique collision between the Kaapvaal Craton and an oceanic island arc to the south. The inclusion of an active continental margin signature in the metasediments is enigmatic, although the geochemistry of the metagreywackes suggests that the margin of the Grunehogna Province is a probable source. Subsequent closure of this basin resulted in inversion and accretion of the metasedimentary sequence onto the southern margin of the Kaapvaal Craton.

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Section: Geochemical Classification and Provenancementioning

confidence: 99%

Tectonic implications from the geochemistry of Mfongosi Group metasediments, Natal Metamorphic Province, South Africa

Basson

Watkeys

2003

South African Journal of Geology

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“…The Index of Composition Variability (ICV) (av. 0.93) (range 0.61- (Condie et al 1991). The host rock is petrographically identified as carbonaceous shale/phyllite with phyllosilicate and carbonaceous matter (visual estimate about 5%) occurring as lamellar structure (Plate 1).…”

Section: Present Workmentioning

confidence: 99%

Occurrence of Proterozoic black shale-hosted uranium mineralisation in Tal Group, Sirmour district, Himachal Pradesh

et al. 2010

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Black shale type uranium deposits, though of low grade (<0.001 to 0.05% U 3 O 8 ), contain large uranium resources because of their immense volume. The Neoproterozoic-Cambrian Krol-Tal Himalayan sequence covering a cumulative area of about 1000 sq km in five different synclinal basins from Sirmour district, Himachal Pradesh in the west to Nainital district, Uttar Pradesh in east contain such black shale horizons. The uranium mineralisation found in black shale in the Nigalidhar syncline of Himachal Pradesh and its implication of being an indicator for search of such uranium deposits in Himalayas is discussed.

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“…Anomalies in U, Th and Ta may be a sign of carbonatitic melts (Andrade et al, 2008). The possible hypothesis is deep seated melting in the arc setting with participation of some sediments (Condie et al, 2001) or metasomatized by arc melts (Hastie et al, 2011). Such a question cannot be solved without isotopy of clinopyroxene xenocrysts.…”

Section: Geochemistry Of Minerals and Parental Melts As The Signs Of mentioning

confidence: 99%

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

Ashchepkov

Kuligin

Vladykin

et al. 2016

Geoscience Frontiers

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a b s t r a c tMantle xenocrysts from early Triassic kimberlite pipes from Kharamai, Ary-Mastakh and Kuranakh fields in the Anabar shield of Siberia revealing similar compositional trends were studied to estimate the superplume influence on the subcratonic lithosphere mantle (SCLM). Pressure-temperature (PT) reconstructions using monomineral thermobarometry for 5 phases show division of the SCLM beneath the Kharamai field into 6 units: pyroxenitic Fe-rich (1e2 GPa) and Mg-rich (2e3 GPa) layers; middle with two levels of Gar-Sp pyroxenites at w3 and 4e5 GPa; Gar-duniteeharzburgites w4.5e6.5 GPa subjected to Ilm-Px vein metasomatism; and a Mg-rich dunite lower part. In the Anabar shield (Ary-Mastakh, Dyuken and Kuranakh fields) mantle lithosphere is composed of three large units divided into two parts: upper part with amphiboles and phlogopite; two levels of pyroxenites and eclogites at 3 and 4 GPa, and a lower part composed of refertilized dunites. Diagrams showing P-Fe # Gar clusters for garnets and omphacites illustrate the differences between SCLM of these localities. Differences of Triassic SCLM from Devonian SCLM are in simple layering; abundance of Na-Cr-amphiboles and metasomatism in the upper SCLM part, thick pyroxenite-eclogite layer and lower part depletion, heated from SCLM base to 5.0 GPa.Kharamai mantle clinopyroxenes represent three geochemical types: (1) harzburgitic with inclined linear REE, HFSE troughs and elevated Th, U; (2) lherzolitic or pyroxenitic with round TRE patterns and decreasing incompatible elements; (3) eclogitic with Eu troughs, Pb peak and high LILE content. Calculated parental melts for garnets with humped REE patterns suggest dissolution of former Cpx and depression means Cpx and garnets extraction. Clinopyroxenes from Ary-Mastakh fields show less inclined REE patterns with HMREE troughs and an increase of incompatible elements. Clinopyroxenes from Kuranakh field show flatter spoon-like REE patterns and peaks in Ba, U, Pb and Sr, similar to those in ophiolitic harzburgites. The PT diagrams for the mantle sections show high temperature gradients in the uppermost SCLM accompanied by an increase of P-Fe # Ol upward and slightly reduced thickness of the mantle keel of the Siberian craton, resulting from the influence of the PermianeTriassic superplume, but with no signs of delamination.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Geochemistry of metasediments from the Precambrian Hapschan Series, eastern Anabar Shield, Siberia

Cited by 46 publications

References 22 publications

Tectonic implications from the geochemistry of Mfongosi Group metasediments, Natal Metamorphic Province, South Africa

Tectonic implications from the geochemistry of Mfongosi Group metasediments, Natal Metamorphic Province, South Africa

Occurrence of Proterozoic black shale-hosted uranium mineralisation in Tal Group, Sirmour district, Himachal Pradesh

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

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