The Carboniferous Batamayineishan volcanic rocks in Eastern Junggar are widely distributed on a huge scale. Studies on geochemistry, geochronology and petrogenesis of these volcanic rocks show that: (1) they have complex volcanic rock types with basalt - andesite - dacite - rhyolite assemblages and are of high-K calc-alkaline series, with enrichment of large ion lithophile elements (LILE) (Sr, K, Rb, Ba, Th) and light rare earth elements (LREE) and depletion of high field strength elements (HFSE) (Nb, Ta, Ti) and heavy rare earth elements (HREE). Besides, the initial 87Sr/86Sr and 143Nd/144Nd ratios are low and the εNd (t) values mostly vary from 3.0 to 6.2. All these features suggest that the volcanic rocks were formed in the immature back-arc basin related to subduction; (2) The Batamayineishan volcanic rocks may be produced by the multi-source materials interaction of young lower crust and deep mantle materials which are mainly composed of the Paleozoic residual oceanic crust and island arc system. The basalts were dominantly derived from the depleted mantle, and the crust-mantle magmatism and the homogenization of the Sm-Nd isotope system have occurred with a small amount of young crustal materials in the magma source. Their formation is likely related to the partial melting of the overlying mantle wedges caused by the fluids generated by the metamorphism and dehydration of subducted sediments and/or subducted oceanic crust. However, the acidic volcanic rocks are the result of the mixing of a small amount of mantle-derived magma undergoing strong crystallization differentiation and a mass of crust-derived materials; (3) The Sm-Nd isochron age of the basalts is (319.7±5.9) Ma, which is consistent with the regional tectonic setting and the evidence from fossils in Batamayineishan Formation, and represents the eruption age of the Batamayineishan volcanic rocks. In summary, we consider that the subduction of the Paleo-Asian Ocean continued in Eastern Junggar around 320Ma, and its final closure time should be between 320 Ma and 310 Ma. During this process, the volcanic magmatisms in Eastern Junggar were very intense and involved abundant mantle-derived materials, implying that Eastern Junggar has a superior prospecting potential.
| Published in | Earth Sciences (Volume 11, Issue 6) |
| DOI | 10.11648/j.earth.20221106.11 |
| Page(s) | 338-354 |
| Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
| Copyright |
Copyright © The Author(s), 2022. Published by Science Publishing Group |
Volcanic Rocks, Geochemistry, Back-arc Basin, Carboniferous, Batamayineishan Formation, Eastern Junggar
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APA Style
Feng Zhang, Tao Xu, Yingchuan Lu. (2022). Last Paleozoic Subduction in Eastern Junggar: Evidence from Geochemistry, Geochronology and Petrogenesis of Carboniferous Volcanic Rocks. Earth Sciences, 11(6), 338-354. https://doi.org/10.11648/j.earth.20221106.11
ACS Style
Feng Zhang; Tao Xu; Yingchuan Lu. Last Paleozoic Subduction in Eastern Junggar: Evidence from Geochemistry, Geochronology and Petrogenesis of Carboniferous Volcanic Rocks. Earth Sci. 2022, 11(6), 338-354. doi: 10.11648/j.earth.20221106.11
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Download@article{10.11648/j.earth.20221106.11,
author = {Feng Zhang and Tao Xu and Yingchuan Lu},
title = {Last Paleozoic Subduction in Eastern Junggar: Evidence from Geochemistry, Geochronology and Petrogenesis of Carboniferous Volcanic Rocks},
journal = {Earth Sciences},
volume = {11},
number = {6},
pages = {338-354},
doi = {10.11648/j.earth.20221106.11},
url = {https://doi.org/10.11648/j.earth.20221106.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.earth.20221106.11},
abstract = {The Carboniferous Batamayineishan volcanic rocks in Eastern Junggar are widely distributed on a huge scale. Studies on geochemistry, geochronology and petrogenesis of these volcanic rocks show that: (1) they have complex volcanic rock types with basalt - andesite - dacite - rhyolite assemblages and are of high-K calc-alkaline series, with enrichment of large ion lithophile elements (LILE) (Sr, K, Rb, Ba, Th) and light rare earth elements (LREE) and depletion of high field strength elements (HFSE) (Nb, Ta, Ti) and heavy rare earth elements (HREE). Besides, the initial 87Sr/86Sr and 143Nd/144Nd ratios are low and the εNd (t) values mostly vary from 3.0 to 6.2. All these features suggest that the volcanic rocks were formed in the immature back-arc basin related to subduction; (2) The Batamayineishan volcanic rocks may be produced by the multi-source materials interaction of young lower crust and deep mantle materials which are mainly composed of the Paleozoic residual oceanic crust and island arc system. The basalts were dominantly derived from the depleted mantle, and the crust-mantle magmatism and the homogenization of the Sm-Nd isotope system have occurred with a small amount of young crustal materials in the magma source. Their formation is likely related to the partial melting of the overlying mantle wedges caused by the fluids generated by the metamorphism and dehydration of subducted sediments and/or subducted oceanic crust. However, the acidic volcanic rocks are the result of the mixing of a small amount of mantle-derived magma undergoing strong crystallization differentiation and a mass of crust-derived materials; (3) The Sm-Nd isochron age of the basalts is (319.7±5.9) Ma, which is consistent with the regional tectonic setting and the evidence from fossils in Batamayineishan Formation, and represents the eruption age of the Batamayineishan volcanic rocks. In summary, we consider that the subduction of the Paleo-Asian Ocean continued in Eastern Junggar around 320Ma, and its final closure time should be between 320 Ma and 310 Ma. During this process, the volcanic magmatisms in Eastern Junggar were very intense and involved abundant mantle-derived materials, implying that Eastern Junggar has a superior prospecting potential.},
year = {2022}
}
TY - JOUR T1 - Last Paleozoic Subduction in Eastern Junggar: Evidence from Geochemistry, Geochronology and Petrogenesis of Carboniferous Volcanic Rocks AU - Feng Zhang AU - Tao Xu AU - Yingchuan Lu Y1 - 2022/11/04 PY - 2022 N1 - https://doi.org/10.11648/j.earth.20221106.11 DO - 10.11648/j.earth.20221106.11 T2 - Earth Sciences JF - Earth Sciences JO - Earth Sciences SP - 338 EP - 354 PB - Science Publishing Group SN - 2328-5982 UR - https://doi.org/10.11648/j.earth.20221106.11 AB - The Carboniferous Batamayineishan volcanic rocks in Eastern Junggar are widely distributed on a huge scale. Studies on geochemistry, geochronology and petrogenesis of these volcanic rocks show that: (1) they have complex volcanic rock types with basalt - andesite - dacite - rhyolite assemblages and are of high-K calc-alkaline series, with enrichment of large ion lithophile elements (LILE) (Sr, K, Rb, Ba, Th) and light rare earth elements (LREE) and depletion of high field strength elements (HFSE) (Nb, Ta, Ti) and heavy rare earth elements (HREE). Besides, the initial 87Sr/86Sr and 143Nd/144Nd ratios are low and the εNd (t) values mostly vary from 3.0 to 6.2. All these features suggest that the volcanic rocks were formed in the immature back-arc basin related to subduction; (2) The Batamayineishan volcanic rocks may be produced by the multi-source materials interaction of young lower crust and deep mantle materials which are mainly composed of the Paleozoic residual oceanic crust and island arc system. The basalts were dominantly derived from the depleted mantle, and the crust-mantle magmatism and the homogenization of the Sm-Nd isotope system have occurred with a small amount of young crustal materials in the magma source. Their formation is likely related to the partial melting of the overlying mantle wedges caused by the fluids generated by the metamorphism and dehydration of subducted sediments and/or subducted oceanic crust. However, the acidic volcanic rocks are the result of the mixing of a small amount of mantle-derived magma undergoing strong crystallization differentiation and a mass of crust-derived materials; (3) The Sm-Nd isochron age of the basalts is (319.7±5.9) Ma, which is consistent with the regional tectonic setting and the evidence from fossils in Batamayineishan Formation, and represents the eruption age of the Batamayineishan volcanic rocks. In summary, we consider that the subduction of the Paleo-Asian Ocean continued in Eastern Junggar around 320Ma, and its final closure time should be between 320 Ma and 310 Ma. During this process, the volcanic magmatisms in Eastern Junggar were very intense and involved abundant mantle-derived materials, implying that Eastern Junggar has a superior prospecting potential. VL - 11 IS - 6 ER -
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