Nd-Sr isotopic and geochemical evidence on the tectonic setting of the Tadun Creek ophiolite, North Qilian fold belt, NW China

Chuan-Hsiung Chung; Alan D. Smith

Nd-Sr isotopic and geochemical evidence on the tectonic setting of the Tadun Creek ophiolite, North Qilian fold belt, NW China

Chuan-Hsiung Chung, Alan D. Smith

Department of Earth Sciences

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Metamorphosed mafic rocks of the Tadun Creek section of the low-grade blueschist belt in the North Qilian terrane include metabasalt, blueschist and metagabbro representing remnants of an Ordovician ocean basin. Metabasalts and blueschists both resemble N-MORB in composition and have εNd(450Ma)=+7.3 to +9.3. Metagabbros are characterised by elevated Al₂O₃, lower εNd (+7.1 to +7.3), lower Ti/V (10-20) and higher Cr/Y (>15) ratios suggesting a relationship to arc volcanism. Market depletion in HFSE abundances in the metagabbros suggests an origin as a supra-subduction ophiolite rather than a back-arc basin sequence, though the latter is not precluded.

Original language	English
Pages (from-to)	31-42
Number of pages	12
Journal	Journal of the Geological Society of China
Volume	43
Issue number	1
Publication status	Published - 2000 Feb 1

All Science Journal Classification (ASJC) codes

Geology

Cite this

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abstract = "Metamorphosed mafic rocks of the Tadun Creek section of the low-grade blueschist belt in the North Qilian terrane include metabasalt, blueschist and metagabbro representing remnants of an Ordovician ocean basin. Metabasalts and blueschists both resemble N-MORB in composition and have εNd(450Ma)=+7.3 to +9.3. Metagabbros are characterised by elevated Al2O3, lower εNd (+7.1 to +7.3), lower Ti/V (10-20) and higher Cr/Y (>15) ratios suggesting a relationship to arc volcanism. Market depletion in HFSE abundances in the metagabbros suggests an origin as a supra-subduction ophiolite rather than a back-arc basin sequence, though the latter is not precluded.",

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AB - Metamorphosed mafic rocks of the Tadun Creek section of the low-grade blueschist belt in the North Qilian terrane include metabasalt, blueschist and metagabbro representing remnants of an Ordovician ocean basin. Metabasalts and blueschists both resemble N-MORB in composition and have εNd(450Ma)=+7.3 to +9.3. Metagabbros are characterised by elevated Al2O3, lower εNd (+7.1 to +7.3), lower Ti/V (10-20) and higher Cr/Y (>15) ratios suggesting a relationship to arc volcanism. Market depletion in HFSE abundances in the metagabbros suggests an origin as a supra-subduction ophiolite rather than a back-arc basin sequence, though the latter is not precluded.

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Nd-Sr isotopic and geochemical evidence on the tectonic setting of the Tadun Creek ophiolite, North Qilian fold belt, NW China

Abstract

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