Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes

Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes

The tectonic evolution of SE China block since late Paleozoic remains debated. Here we present a new set of zircon U-Pb geochronological, Lu-Hf isotopic data and whole-rock geochemistry for two stages of basic-intermediate dykes from the southwestern Fujian. The samples were collected from the NE-tr...

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Main Authors: Sen Wang, Da Zhang, Ganguo Wu, Absai Vatuva, Yongjun Di, Pengcheng Yan, Haibin Feng, Shuai Ma
Format: Article
Language:English
Published: Elsevier 2017-05-01
Series:Geoscience Frontiers
Subjects:
Diabase
Late Paleozoic
Extensional tectonics
Southwestern Fujian
Online Access:http://www.sciencedirect.com/science/article/pii/S1674987116300482
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spelling doaj-12ebeb5ce8c24c829fa13af2216875ed2020-11-24T21:34:25ZengElsevierGeoscience Frontiers1674-98712017-05-018352954010.1016/j.gsf.2016.05.005Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykesSen Wang0Da Zhang1Ganguo Wu2Absai Vatuva3Yongjun Di4Pengcheng Yan5Haibin Feng6Shuai Ma7State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, ChinaNew Brunswick University, Fredericton, New Brunswick, CanadaThe tectonic evolution of SE China block since late Paleozoic remains debated. Here we present a new set of zircon U-Pb geochronological, Lu-Hf isotopic data and whole-rock geochemistry for two stages of basic-intermediate dykes from the southwestern Fujian. The samples were collected from the NE-trending (mainly diabases) and NW-trending (mainly diabasic diorites) dykes and yielded zircon U-Pb ages of 315 and 141 Ma, with εHf (t) values of −8.90 to 7.49 and −23.39 to −7.15 (corresponding to TDM2 values of 850 to 1890 Ma and 737 to 2670 Ma), respectively. Geochemically these rocks are characterized by low TiO2 (0.91–1.73 wt.%) and MgO (3.04–7.96 wt.%), and high Al2O3 (12.5–16.60 wt.%) and K2O (0.60–3.63 wt.%). Further they are enriched in LREEs and LILEs (Rb, Ba, Th and K), but depleted in HFSEs (Nb, Ta and Zr). The tectonic discrimination analysis revealed that the dykes were formed in an intraplate extensional environment. However, the NW trending dykes show crust-mantle mixed composition, which indicate an extensional tectonic setting with evidence for crustal contamination. The SE China block experienced two main stages of extensional tectonics from late Carboniferous to early Cretaceous. The tectonic evolution of the SE China block from late Devonian to Cretaceous is also evaluated.http://www.sciencedirect.com/science/article/pii/S1674987116300482DiabaseLate PaleozoicExtensional tectonicsSouthwestern Fujian
collection DOAJ
language English
format Article
sources DOAJ
author Sen Wang
Da Zhang
Ganguo Wu
Absai Vatuva
Yongjun Di
Pengcheng Yan
Haibin Feng
Shuai Ma
spellingShingle Sen Wang
Da Zhang
Ganguo Wu
Absai Vatuva
Yongjun Di
Pengcheng Yan
Haibin Feng
Shuai Ma
Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes
Geoscience Frontiers
Diabase
Late Paleozoic
Extensional tectonics
Southwestern Fujian
author_facet Sen Wang
Da Zhang
Ganguo Wu
Absai Vatuva
Yongjun Di
Pengcheng Yan
Haibin Feng
Shuai Ma
author_sort Sen Wang
title Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes
title_short Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes
title_full Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes
title_fullStr Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes
title_full_unstemmed Late Paleozoic to Mesozoic extension in southwestern Fujian Province, South China: Geochemical, geochronological and Hf isotopic constraints from basic-intermediate dykes
title_sort late paleozoic to mesozoic extension in southwestern fujian province, south china: geochemical, geochronological and hf isotopic constraints from basic-intermediate dykes
publisher Elsevier
series Geoscience Frontiers
issn 1674-9871
publishDate 2017-05-01
description The tectonic evolution of SE China block since late Paleozoic remains debated. Here we present a new set of zircon U-Pb geochronological, Lu-Hf isotopic data and whole-rock geochemistry for two stages of basic-intermediate dykes from the southwestern Fujian. The samples were collected from the NE-trending (mainly diabases) and NW-trending (mainly diabasic diorites) dykes and yielded zircon U-Pb ages of 315 and 141 Ma, with εHf (t) values of −8.90 to 7.49 and −23.39 to −7.15 (corresponding to TDM2 values of 850 to 1890 Ma and 737 to 2670 Ma), respectively. Geochemically these rocks are characterized by low TiO2 (0.91–1.73 wt.%) and MgO (3.04–7.96 wt.%), and high Al2O3 (12.5–16.60 wt.%) and K2O (0.60–3.63 wt.%). Further they are enriched in LREEs and LILEs (Rb, Ba, Th and K), but depleted in HFSEs (Nb, Ta and Zr). The tectonic discrimination analysis revealed that the dykes were formed in an intraplate extensional environment. However, the NW trending dykes show crust-mantle mixed composition, which indicate an extensional tectonic setting with evidence for crustal contamination. The SE China block experienced two main stages of extensional tectonics from late Carboniferous to early Cretaceous. The tectonic evolution of the SE China block from late Devonian to Cretaceous is also evaluated.
topic Diabase
Late Paleozoic
Extensional tectonics
Southwestern Fujian
url http://www.sciencedirect.com/science/article/pii/S1674987116300482
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