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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2018.1
- 수록면
- 711 - 732 (22page)
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The Simorgh prospecting area is located in the central part of the Lut Block in eastern Iran. The Lut Block, the eastern part of the Central Iranian Microcontinent (CIM), has a complex tectonic evolution and is characterized by extensive magmatic activities with a range of geochemical signatures. The Simorgh intrusions have features typical of calc-alkaline to high-K calc-alkaline rocks, metaluminous to slightly peraluminous and formed in a volcanic arc setting. Mineralization in the area is believed to be related to these intrusions. To better understand the petrogenesis of these intrusions, we report zircon U-Pb dating and Hf isotopes and whole rock geochemistry of two granites and one diorite. Age dating using Zircon U-Pb method on pyroxene diorite porphyry stock and two granite porphyry dikes revealed 24.85 ± 0.51 Ma, 25.37 ± 0.56 Ma and 25.94 ± 0.76 Ma ages respectively (late Oligocene, Chattian). Field observations and U-Pb dating indicate that there are at least two stages of emplacement: pre-mineralization intrusions (diorite porphyry) and syn-mineralization intrusions (granite porphyry, granodiorite porphyry and pyroxene diorite porphyry). Mantle-normalized, trace-element spider diagrams display enrichment in large ion lithophile elements (LILE) and light rare earth elements ((La/Yb)N = 9.26–14.48), and depletion in high field strength elements (HFSE) and heavy rare earth elements, as well as negative Eu anomalies (Eu/Eu* = 0.49–0.91). Zircon Hf isotope data from the Simorgh intrusive rocks show largely positive εHf(t) (average = 3.6 ± 2.0). Hf model ages are ranging from 720 to 1320 Ma, indicating its derivation from a relatively juvenile source. The presence of zircon xenocrysts may prove its contamination by older continental crust (Siderian).
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참고문헌 (84)
참고문헌 신청
Allen, M.B. / 2011 / Rightlateral shear across Iran and kinematic change in the Arabia-Eurasia collision zone / Geophysical Journal International 184:555~574
Almeida, M.E. / 2007 / Geochemistry and zircon geochronology of the I-Type high K calc-alkaline and S-Type granitoid rocks from Southeastern Roraima, Brazil: Orosirian collisional magmatism evidence (1.97-1.96 Ga) in central portion of Guyana shield / Precambrian Research 155:69~97
Arjmandzadeh, R. / 2011 / Sr/Nd isotope geochemistry and petrogenesis of the Chah-Shaljami granitoids (Lut Block, Eastern Iran) / Journal of Asian Earth Sciences 41:283~296
Arjmandzadeh, R. / 2014 / Sr-Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu-Mo porphyry mineralizing intrusives from Lut Block, eastern Iran / International Journal of Earth Sciences 103:123~140
Babazadeh, S.A. / 2004 / Early Cretaceous radiolarian assemblages from radiolarites in the Sistan Suture (eastern Iran) / Geodiversitas 26:185~206
Almeida, M.E. / 2007 / Geochemistry and zircon geochronology of the I-Type high K calc-alkaline and S-Type granitoid rocks from Southeastern Roraima, Brazil: Orosirian collisional magmatism evidence (1.97-1.96 Ga) in central portion of Guyana shield / Precambrian Research 155:69~97
Arjmandzadeh, R. / 2011 / Sr/Nd isotope geochemistry and petrogenesis of the Chah-Shaljami granitoids (Lut Block, Eastern Iran) / Journal of Asian Earth Sciences 41:283~296
Arjmandzadeh, R. / 2014 / Sr-Nd isotope geochemistry and tectonomagmatic setting of the Dehsalm Cu-Mo porphyry mineralizing intrusives from Lut Block, eastern Iran / International Journal of Earth Sciences 103:123~140
Babazadeh, S.A. / 2004 / Early Cretaceous radiolarian assemblages from radiolarites in the Sistan Suture (eastern Iran) / Geodiversitas 26:185~206
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