Next Article in Journal
Distribution of Selenium in the Soil–Plant–Groundwater System: Factors Controlling Its Bio-Accumulation
Next Article in Special Issue
Geochemistry and Zircon U-Pb-Hf Isotopes of Metamorphic Rocks from the Kaiyuan and Hulan Tectonic Mélanges, NE China: Implications for the Tectonic Evolution of the Paleo-Asian and Mudanjiang Oceans
Previous Article in Journal
Elemental Geochemical Characterization of Sedimentary Conditions and Organic Matter Enrichment for Lower Cambrian Shale Formations in Northern Guizhou, South China
Previous Article in Special Issue
Zircon U-Pb Dating of Magmatism and Mineralizing Hydrothermal Activity in the Variscan Karkonosze Massif and Its Eastern Metamorphic Cover (SW Poland)
Open AccessArticle

The Early Silurian Gabbro in the Eastern Kunlun Orogenic Belt, Northeast Tibet: Constraints on the Proto-Tethyan Ocean Closure

by 1,*, 1,2, 1,3 and 1,4,5
1
Institute of Geological survey, China University of Geosciences, Wuhan 430074, China
2
Research Institute of Petroleum Exploration & Development, Sinopec Northwest China Petroleum Bureau, Urumqi 830011, China
3
School of Earth and Space Sciences, Peking University, Beijing 100871, China
4
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
5
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(9), 794; https://doi.org/10.3390/min10090794
Received: 16 July 2020 / Revised: 24 August 2020 / Accepted: 24 August 2020 / Published: 8 September 2020
The early Paleozoic is a crucial period in the formation and evolution of the Eastern Kunlun Orogenic Belt (EKOB), and is of great significance for understanding the evolutionary history of the Proto-Tethyan Ocean. This paper presents new petrography, geochemistry, zircon U–Pb dating, and Lu–Hf isotopic research on the Yuejingshan gabbro from the eastern segment of the EKOB. Zircon U–Pb data suggests that the gabbro formed in the Early Silurian (435 ± 2 Ma). All samples have relatively low TiO2 contents (0.45–2.97%), widely varying MgO (6.58–8.41%) and Mg# (58–65) contents, and are rich in large ion lithophile elements (LILE such as Rb, Ba, Th, and U) and light rare earth elements (LREE). This indicates that it has a similar geochemical composition to island arc basalt. The major element features indicate that the formation of this gabbro underwent fractional crystallization of clinopyroxene, olivine, and plagioclase. The depletion of high field strength elements (HFSE, such as Nb, Ta, and Ti), and a slightly positive Hf isotope (with εHf(t) ranging from 1.13 to 2.45) may be related to the partial melting of spinel-bearing peridotite, led by slab fluid metasomatism. The gabbro likely represents magmatic records of the latest period of the early Paleozoic oceanic crust subduction in the Eastern Kunlun. Therefore, the final closure of the Proto-Tethyan Ocean and the beginning of collisional orogeny occurred before the Early Silurian. View Full-Text
Keywords: northeast Tibet; Proto-Tethyan Ocean; early Silurian; eastern Kunlun Orogenic Belt; gabbro; zircon U–Pb dating northeast Tibet; Proto-Tethyan Ocean; early Silurian; eastern Kunlun Orogenic Belt; gabbro; zircon U–Pb dating
Show Figures

Figure 1

MDPI and ACS Style

Zhou, W.; Li, H.; Chang, F.; Lv, X. The Early Silurian Gabbro in the Eastern Kunlun Orogenic Belt, Northeast Tibet: Constraints on the Proto-Tethyan Ocean Closure. Minerals 2020, 10, 794. https://doi.org/10.3390/min10090794

AMA Style

Zhou W, Li H, Chang F, Lv X. The Early Silurian Gabbro in the Eastern Kunlun Orogenic Belt, Northeast Tibet: Constraints on the Proto-Tethyan Ocean Closure. Minerals. 2020; 10(9):794. https://doi.org/10.3390/min10090794

Chicago/Turabian Style

Zhou, Wenxiao; Li, Haiquan; Chang, Feng; Lv, Xinbiao. 2020. "The Early Silurian Gabbro in the Eastern Kunlun Orogenic Belt, Northeast Tibet: Constraints on the Proto-Tethyan Ocean Closure" Minerals 10, no. 9: 794. https://doi.org/10.3390/min10090794

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop