Late Mesozoic granitic rocks are widely distributed in the Sulu orogenic belt, but the source, tectonic affinity, and associated geodynamic setting that produced the respective magmas remain controversial. To provide insights into these issues, we present field-based petrological, whole-rock major and trace element and Sr–Nd isotope geochemical, zircon U–Pb dating, and Lu–Hf isotope studies on two types of granite porphyry dykes that are newly recognized from the central Sulu belt. U–Pb dating of magmatic zircons from both types yields consistent ages that vary between 124 ± 2 and 118 ± 2 Ma, constraining the timing of intrusion as Early Cretaceous. The granitic rocks have high-K calc-alkaline peraluminous compositions with low Mg# values and are characterized by fractionated rare earth element patterns with strong depletion in high field strength elements. Compared with type I of the granite porphyry dykes, type II exhibits higher SiO2 but slightly lower Na2O and K2O abundances, contains higher Rb/Sr and 87Sr/86Sr ratios, and shows more pronounced negative Eu, Sr, and Ba anomalies. Both types I and II have high initial 87Sr/86Sr ratios of 0.709–0.711 and negative εNd(t) values of −19.8 to −18.4. The magmatic zircons possess negative εHf(t) values of −29.1 to −20.8, with mostly Neoarchean Hf model ages of 3001–2478 Ma. These features, together with the presence of Neoproterozoic inherited zircons, indicate that the two types of granite porphyries successively crystallized from a joint granite magma that derived from partial melting of the continental crust of the Yangtze Craton. Therefore, an interrelationship between the granite porphyry dykes and massive magmatic granitoids from adjacent regions in the Sulu belt may be documented, recording evidence of a joint ancient crustal reworking and recycling in a fossilized continental subduction zone during the Early Cretaceous.
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Research Article|
May 13, 2019
Geochemistry, geochronology and Sr–Nd–Hf isotopes of two types of Early Cretaceous granite porphyry dykes in the Sulu orogenic belt, eastern China
Song-Jie Wang
;
a
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.b
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.Corresponding author: Song-Jie Wang (email: cugsongjie@foxmail.com).
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Hans-Peter Schertl
;
Hans-Peter Schertl
a
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.c
Faculty of Geosciences, Institute of Geology, Mineralogy and Geophysics, Ruhr-University Bochum, 44780 Bochum, Germany.
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Yu-Mao Pang
Yu-Mao Pang
a
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.b
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
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Canadian Journal of Earth Sciences (2020) 57 (2): 249–266.
Article history
received:
09 Jan 2019
accepted:
07 May 2019
first online:
07 Feb 2020
Citation
Song-Jie Wang, Hans-Peter Schertl, Yu-Mao Pang; Geochemistry, geochronology and Sr–Nd–Hf isotopes of two types of Early Cretaceous granite porphyry dykes in the Sulu orogenic belt, eastern China. Canadian Journal of Earth Sciences 2019;; 57 (2): 249–266. doi: https://doi.org/10.1139/cjes-2019-0003
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Index Terms/Descriptors
- absolute age
- alkaline earth metals
- Asia
- chemical composition
- China
- Cretaceous
- dikes
- emplacement
- Far East
- genesis
- granite porphyry
- granites
- hafnium
- Hf-177/Hf-176
- igneous rocks
- intrusions
- isotope ratios
- isotopes
- Lower Cretaceous
- lutetium
- Mesozoic
- metals
- Nd-144/Nd-143
- neodymium
- nesosilicates
- orthosilicates
- petrography
- plutonic rocks
- rare earths
- Shandong China
- silicates
- Sr-87/Sr-86
- stable isotopes
- strontium
- Sulu Terrane
- U/Pb
- zircon
- zircon group
- Hf-177/Lu-176
- Yangkou China
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