Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton

Differentiating magmatic doming and low-angle normal faulting remains critical for fully understanding the thermal, mechanical and chemical evolution of continental landmasses under extension. This zircon U–Pb dating and geochemical study documents two Middle to Late Jurassic batholiths (Lüshan and...

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Main Authors:	Zhang, X., Yuan, L., Wilde, Simon
Format:	Journal Article
Published:	Elsevier BV 2014
Subjects:	Petrogenesis Calc-alkaline batholith Middle–Late Jurassic North China Craton Crust–mantle interaction
Online Access:	http://hdl.handle.net/20.500.11937/17660

id	curtin-20.500.11937-17660
recordtype	eprints
spelling	curtin-20.500.11937-176602017-09-13T15:44:33Z Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton Zhang, X. Yuan, L. Wilde, Simon Petrogenesis Calc-alkaline batholith Middle–Late Jurassic North China Craton Crust–mantle interaction Differentiating magmatic doming and low-angle normal faulting remains critical for fully understanding the thermal, mechanical and chemical evolution of continental landmasses under extension. This zircon U–Pb dating and geochemical study documents two Middle to Late Jurassic batholiths (Lüshan and Haitangshan) from the Yiwulüshan range of western Liaoning, North China Craton. They consist of a variety of lithologies including gabbro, diorite, granodiorite, monzogranite, together with microgranular magmatic enclaves (MME) and mafic dykes. Synthesizing petrologic, elemental, whole-rock Sr–Nd and zircon Hf isotopic data leads to the characterization of multiple mafic and felsic end-members and their concomitant interaction in building the magmatic dome. A subduction-related metasomatized lithospheric mantle source is fingerprinted by the gabbroic to dioritic rocks with enriched large ion lithophile elements, depleted high field strength elements and heterogeneous isotopic compositions (87Sr/86Sri = 0.70541 to 0.70577, εNd(t) = − 1.78 to − 5.54 and zircon εHf(t) = − 6.0 to 8.1). One felsic magma end-member of ancient mafic lower crustal parentage is discernable from adakitic granites with high Sr/Y and evolved isotopic composition (87Sr/86Sri = 0.70533 to 0.70792, εNd(t) = − 18.8 to − 21.7, zircon εHf(t) = − 18.5 to − 28.8), whereas another felsic magma end-member of newly underplated crustal heritage manifests itself from some monzogranites with non-adakitic elemental affinity and juvenile isotopic composition (87Sr/86Sri = 0.70429 to 0.70587, εNd(t) = − 4.47 to − 5.87, zircon εHf(t) = 4.3 to 1.3). Hybridization processes between mantle-derived mafic magma and ancient crustal-derived felsic magma result in the formation of MME-bearing granodiorites with intermediate isotopic signatures (87Sr/86Sri = 0.70491 to 0.70499, εNd(t) = − 15.3 to − 15.8, zircon εHf(t) = − 12.7 to − 17.4). Subsequent fractional crystallization of the hybridized magmas endows the differentiated monzogranites with low Sr/Y and highly evolved isotopes (87Sr/86Sri = 0.70496 to 0.70605, εNd(t) = − 16.0 to − 18.7, zircon εHf(t) = − 14.3 to − 21.5). Apart from distinguishing Middle–Late Jurassic extensional magmatic doming from Early Cretaceous detachment faulting, this complex mafic–felsic magma association encapsulates a multi-level crust/mantle interaction leading to lithospheric thinning and concomitant crustal architectural reorganization in the Yanshan belt during the Late Mesozoic. Near-synchronization of a two-stage extensional pattern in the Yanshan belt and even across NE continental Asia accords well with gravitational collapse and convective removal of lithospheric mantle within an evolved post-collisional to within-plate extensional regime. 2014 Journal Article http://hdl.handle.net/20.500.11937/17660 10.1016/j.lithos.2014.07.006 Elsevier BV restricted
repository_type	Digital Repository
institution_category	Local University
institution	Curtin University Malaysia
building	Curtin Institutional Repository
collection	Online Access
topic	Petrogenesis Calc-alkaline batholith Middle–Late Jurassic North China Craton Crust–mantle interaction
spellingShingle	Petrogenesis Calc-alkaline batholith Middle–Late Jurassic North China Craton Crust–mantle interaction Zhang, X. Yuan, L. Wilde, Simon Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton
description	Differentiating magmatic doming and low-angle normal faulting remains critical for fully understanding the thermal, mechanical and chemical evolution of continental landmasses under extension. This zircon U–Pb dating and geochemical study documents two Middle to Late Jurassic batholiths (Lüshan and Haitangshan) from the Yiwulüshan range of western Liaoning, North China Craton. They consist of a variety of lithologies including gabbro, diorite, granodiorite, monzogranite, together with microgranular magmatic enclaves (MME) and mafic dykes. Synthesizing petrologic, elemental, whole-rock Sr–Nd and zircon Hf isotopic data leads to the characterization of multiple mafic and felsic end-members and their concomitant interaction in building the magmatic dome. A subduction-related metasomatized lithospheric mantle source is fingerprinted by the gabbroic to dioritic rocks with enriched large ion lithophile elements, depleted high field strength elements and heterogeneous isotopic compositions (87Sr/86Sri = 0.70541 to 0.70577, εNd(t) = − 1.78 to − 5.54 and zircon εHf(t) = − 6.0 to 8.1). One felsic magma end-member of ancient mafic lower crustal parentage is discernable from adakitic granites with high Sr/Y and evolved isotopic composition (87Sr/86Sri = 0.70533 to 0.70792, εNd(t) = − 18.8 to − 21.7, zircon εHf(t) = − 18.5 to − 28.8), whereas another felsic magma end-member of newly underplated crustal heritage manifests itself from some monzogranites with non-adakitic elemental affinity and juvenile isotopic composition (87Sr/86Sri = 0.70429 to 0.70587, εNd(t) = − 4.47 to − 5.87, zircon εHf(t) = 4.3 to 1.3). Hybridization processes between mantle-derived mafic magma and ancient crustal-derived felsic magma result in the formation of MME-bearing granodiorites with intermediate isotopic signatures (87Sr/86Sri = 0.70491 to 0.70499, εNd(t) = − 15.3 to − 15.8, zircon εHf(t) = − 12.7 to − 17.4). Subsequent fractional crystallization of the hybridized magmas endows the differentiated monzogranites with low Sr/Y and highly evolved isotopes (87Sr/86Sri = 0.70496 to 0.70605, εNd(t) = − 16.0 to − 18.7, zircon εHf(t) = − 14.3 to − 21.5). Apart from distinguishing Middle–Late Jurassic extensional magmatic doming from Early Cretaceous detachment faulting, this complex mafic–felsic magma association encapsulates a multi-level crust/mantle interaction leading to lithospheric thinning and concomitant crustal architectural reorganization in the Yanshan belt during the Late Mesozoic. Near-synchronization of a two-stage extensional pattern in the Yanshan belt and even across NE continental Asia accords well with gravitational collapse and convective removal of lithospheric mantle within an evolved post-collisional to within-plate extensional regime.
format	Journal Article
author	Zhang, X. Yuan, L. Wilde, Simon
author_facet	Zhang, X. Yuan, L. Wilde, Simon
author_sort	Zhang, X.
title	Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton
title_short	Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton
title_full	Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton
title_fullStr	Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton
title_full_unstemmed	Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton
title_sort	crust/mantle interaction during the construction of an extensional magmatic dome: middle to late jurassic plutonic complex from western liaoning, north china craton
publisher	Elsevier BV
publishDate	2014
url	http://hdl.handle.net/20.500.11937/17660
first_indexed	2018-09-06T19:45:59Z
last_indexed	2018-09-06T19:45:59Z
_version_	1610888679328317440

Crust/mantle interaction during the construction of an extensional magmatic dome: Middle to Late Jurassic plutonic complex from western Liaoning, North China Craton

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