The Carboniferous Arc of the North Pamir

Author:

Rembe Johannes1ORCID,Sobel Edward R.1ORCID,Kley Jonas2ORCID,Zhou Renjie3ORCID,Thiede Rasmus4ORCID,Chen Jie5ORCID

Affiliation:

1. Institute of Geosciences University of Potsdam 14476 Golm Potsdam Germany uni-potsdam.de

2. Department of Structural Geology and Geodynamics Georg-August-Universität Göttingen 37077 Göttingen Germany uni-goettingen.de

3. School of Earth and Environmental Sciences The University of Queensland St. Lucia QLD 4072 Australia uq.edu.au

4. Institute for Geosciences Christian-Albrechts-Universität Kiel 24118 Kiel Germany uni-kiel.de

5. State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration X9GJ+RV Chaoyang Beijing China cea.gov.cn

Abstract

Abstract In this study, we investigate the age and geochemical variability of volcanic arc rocks found in the Chinese, Kyrgyz, and Tajik North Pamir in Central Asia. New geochemical and geochronological data together with compiled data from the literature give a holistic view of an early to mid-Carboniferous intraoceanic arc preserved in the northeastern Pamir. This North Pamir volcanic arc complex involves continental slivers in its western reaches and transforms into a Cordilleran-style collision zone with arc-magmatic rocks. These are hosted in part by Devonian to Carboniferous oceanic crust and the metamorphic Kurguvad basement block of Ediacaran age (maximum deposition age) in Tajikistan. We discuss whether a sliver of Carboniferous subduction-related basalts and intruded tonalites close to the Chinese town of Mazar was part of the same arc. LA-ICP-MS U-Pb dating of zircons, together with whole rock geochemistry derived from tonalitic to granodioritic intrusions, reveals a major Visean to Bashkirian intrusive phase between 340 and 320 Ma ago. This clearly postdates Paleozoic arc-magmatic activity in the West Kunlun by ~100 Ma. This observation, along with geochemical evidence for a more pronounced mantle component in the Carboniferous arc-magmatic rocks of the North Pamir, disagrees with the common model of a continuous Kunlun belt from the West Kunlun into the North Pamir. Moreover, Paleozoic oceanic units younger than and west of the Tarim cratonic crust challenge the idea of a continuous cratonic Tarim-Tajik continent beneath the Pamir.

Funder

National Geographic Society

Deutsche Forschungsgemeinschaft

Publisher

GeoScienceWorld

Subject

Geology

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