LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significance
In order to determine the tectonic regime change of the early Mesozoic in the South China Block, this study analyzed sedimentary rocks in the Middle Jurassic of southwestern Fujian by modal analysis of sandstones, elemental geochemical analysis of mudstones, and detrital zircons U–Pb dating. The res...
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De Gruyter
2020-10-01
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| Series: | Open Geosciences |
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| Online Access: | https://doi.org/10.1515/geo-2020-0185 |
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| author | Zhongjie Xu Jintao Kong Rihui Cheng Yizhi Lan Liaoliang Wang |
| author_facet | Zhongjie Xu Jintao Kong Rihui Cheng Yizhi Lan Liaoliang Wang |
| author_sort | Zhongjie Xu |
| collection | DOAJ |
| description | In order to determine the tectonic regime change of the early Mesozoic in the South China Block, this study analyzed sedimentary rocks in the Middle Jurassic of southwestern Fujian by modal analysis of sandstones, elemental geochemical analysis of mudstones, and detrital zircons U–Pb dating. The results show that the detrital zircons in Southwestern Fujian mainly consist of Paleoproterozoic to early Mesozoic zircons in the Middle Jurassic. Within the Dongkeng profile of the Zhangping Formation, DK5 sample (lower part) showed a major age peak at ca. 1,848 Ma and two secondary age peaks at ca. 235 and 180 Ma, while DK15 sample (middle part) showed a major age peak at ca. 1,876 Ma and two secondary age peaks at ca. 233 and 190 Ma; the age compositions of these two samples’ were similar. Modal analysis of sandstones indicated that sediments of Zhangping Formation might source from arc orogen and recycled orogen, and element geochemical analysis showed that source rocks of Zhangping Formation might be sedimentary rocks and granites. The Indosinian zircons were mainly derived from the Wuyi region, and the Yanshanian zircons were mainly derived from the Nanling region. The major age group changes from ca. 230 to 220 Ma of the Late Triassic – Early Jurassic to ca. 190 to 180 Ma of the Middle Jurassic in Southwestern Fujian, and main sources changed from Indosinian magmatic rocks in the Late Triassic – Early Jurassic to early Yanshanian magmatic rocks in the Middle Jurassic. |
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| language | English |
| last_indexed | 2024-12-17T23:21:45Z |
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| spelling | doaj.art-d8d627353e314556895619ad9fa15db22022-12-21T21:28:52ZengDe GruyterOpen Geosciences2391-54472020-10-0112195897610.1515/geo-2020-0185geo-2020-0185LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significanceZhongjie Xu0Jintao Kong1Rihui Cheng2Yizhi Lan3Liaoliang Wang4College of Earth Sciences, Jilin University, Changchun 130061, Jilin, ChinaCollege of Earth Sciences, Jilin University, Changchun 130061, Jilin, ChinaCollege of Earth Sciences, Jilin University, Changchun 130061, Jilin, ChinaCollege of Earth Sciences, Jilin University, Changchun 130061, Jilin, ChinaGuangzhou Bureau of Marine Geology Survey, Guangzhou 510075, Guangdong, ChinaIn order to determine the tectonic regime change of the early Mesozoic in the South China Block, this study analyzed sedimentary rocks in the Middle Jurassic of southwestern Fujian by modal analysis of sandstones, elemental geochemical analysis of mudstones, and detrital zircons U–Pb dating. The results show that the detrital zircons in Southwestern Fujian mainly consist of Paleoproterozoic to early Mesozoic zircons in the Middle Jurassic. Within the Dongkeng profile of the Zhangping Formation, DK5 sample (lower part) showed a major age peak at ca. 1,848 Ma and two secondary age peaks at ca. 235 and 180 Ma, while DK15 sample (middle part) showed a major age peak at ca. 1,876 Ma and two secondary age peaks at ca. 233 and 190 Ma; the age compositions of these two samples’ were similar. Modal analysis of sandstones indicated that sediments of Zhangping Formation might source from arc orogen and recycled orogen, and element geochemical analysis showed that source rocks of Zhangping Formation might be sedimentary rocks and granites. The Indosinian zircons were mainly derived from the Wuyi region, and the Yanshanian zircons were mainly derived from the Nanling region. The major age group changes from ca. 230 to 220 Ma of the Late Triassic – Early Jurassic to ca. 190 to 180 Ma of the Middle Jurassic in Southwestern Fujian, and main sources changed from Indosinian magmatic rocks in the Late Triassic – Early Jurassic to early Yanshanian magmatic rocks in the Middle Jurassic.https://doi.org/10.1515/geo-2020-0185indosinian movementmiddle jurassicprovenancesouthern china blocksouthwestern fujianzircon u–pb ages |
| spellingShingle | Zhongjie Xu Jintao Kong Rihui Cheng Yizhi Lan Liaoliang Wang LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significance Open Geosciences indosinian movement middle jurassic provenance southern china block southwestern fujian zircon u–pb ages |
| title | LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significance |
| title_full | LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significance |
| title_fullStr | LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significance |
| title_full_unstemmed | LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significance |
| title_short | LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significance |
| title_sort | la icp ms u pb ages of detrital zircons from middle jurassic sedimentary rocks in southwestern fujian sedimentary provenance and its geological significance |
| topic | indosinian movement middle jurassic provenance southern china block southwestern fujian zircon u–pb ages |
| url | https://doi.org/10.1515/geo-2020-0185 |
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