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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 933 - 949 (17page)
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초록· 키워드
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The timing of closure of the paleo-Asian Ocean in northeastern China remains contentious. To investigate this problem and better constrain the final closure time of the paleo-Asian Ocean, we report the geochemical characteristics, zircon U-Pb chronology, and Hf isotopes of the Yangjin’gou granite porphyry in the Hunchun region in the easternmost segment of the Solonker-Xar Moron-Changchun-Yanji Suture (SXCYS). The zircon U-Pb age of the Yangjin’gou granite porphyry is 247.1 ± 1.5 Ma (mean square weighted deviation = 0.7). Initial εHf(t) values are high and positive, ranging from +11.2 to +13.3 with an average of +12.7, and the two-stage Hf isotope model age TDM2 is 520–350 Ma. The geochemical characteristics of the granite porphyry indicate that the rocks belong to the calc-alkaline series and are rich in Si, alkali, and Al, and poor in Ca. These rocks also have a rare-earth element distribution pattern that is smooth and inclined down to the right in spider diagrams, weak negative to positive Eu anomalies (Eu/Eu* = 0.83–1.01), moderate enrichment of large-ion lithophile elements (e.g., Cs, Ba, Rb, and K) and radioactive incompatible elements (e.g., Th and U), and depletion in high field strength elements (e.g., Ti, Nb, and Ta). The geochemical and isotope data of the rocks indicate that the Yangjin’gou granite porphyry is a high-Ba-Sr granite and that the primitive magma of the Yangjin’gou rocks originated from the partial melting of juvenile crust. Given the location of the Yangjin’gou granite prophyry in the Hunchun region in the easternmost segment of the SXCYS, these rocks are inferred to have formed in a tectonic setting that changed from continental collision to post-collision extension at ~247 Ma, clearly later than the middle Permian closure time of the paleo-Asian Ocean along the middle segment of the North China Craton. The age of ~247 Ma, or a little earlier, represents the closure time of the paleo-Asian Ocean in the easternmost segment of the SXCYS.
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참고문헌 (114)
참고문헌 신청
Bao, Z. W. / 1994 / Study on REE and Sm-Nd isotopes of Hegenshan Ophiolite, Inner Mongolia / Geochimica 23:339~349
Batchelor, R. A. / 1985 / Petrogenetic interpretation of granitoid rock series using multicationic parameters / Chemical Geology 48:43~55
Belousova, E. A. / 2002 / Igneous zircon : trace element composition as an indicator of source rock type / Contributions to Mineralogy and Petrology 143:602~622
Blichert-Toft, J. / 1997 / The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system / Earth and Planetary Science Letters 148:243~258
Cao, H. H. / 2013 / Geochronology and geochemistry of the Late Paleo-zoic-Early Mesozoic igneous rocks in the eastern segment of the northern margin of the North China Block
Batchelor, R. A. / 1985 / Petrogenetic interpretation of granitoid rock series using multicationic parameters / Chemical Geology 48:43~55
Belousova, E. A. / 2002 / Igneous zircon : trace element composition as an indicator of source rock type / Contributions to Mineralogy and Petrology 143:602~622
Blichert-Toft, J. / 1997 / The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system / Earth and Planetary Science Letters 148:243~258
Cao, H. H. / 2013 / Geochronology and geochemistry of the Late Paleo-zoic-Early Mesozoic igneous rocks in the eastern segment of the northern margin of the North China Block
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