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#1Takeshi Kuritani (Hokkaido University)H-Index: 17
#2Chizuko Kanai (Hokkaido University)
Last.Mitsuhiro Nakagawa (Hokkaido University)H-Index: 12
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Abstract Akita-Komagatake is an active volcano in the Northeast Japan arc with a slab depth (H) of ~110 km. In this study, magma generation conditions were estimated for basaltic products from the volcano to examine the thermal structure of the sub-arc mantle and the across-arc variations in the parameters related to magma genesis. The studied basalts have the highest MgO content (~6 wt%) among the products from the volcano and contain ~15% plagioclase phenocrysts, ~5% olivine phenocrysts, and
#1Xiao-Qiang Liu (Hohai University)
#2Chuan-Lin Zhang (Hohai University)H-Index: 3
Last.Xiao-Shu Hao (Hohai University)
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Abstract The West Kunlun Orogenic Belt (WKOB) carries key information about the evolution of the Proto-Tethys Ocean. In order to have a better understanding of the early Paleozoic tectonic evolution of the WKOB and to unravel the process of the Tarim assemblage to Gondwana, we report field observations, petrography, ages, chemical and Sr-Nd-Hf isotopic compositions of the newly identified Cambrian mafic and granitic intrusions in the Mazar Terrane-Tianshuihai terrane (MZT-TSHT) at the interior o...
#1Takahiro Yamamoto (AIST: National Institute of Advanced Industrial Science and Technology)H-Index: 22
#2Hoang NguyenH-Index: 8
Abstract The late Cenozoic Southwest Japan arc was formed by hot subduction of the young Shikoku Basin slab, and Daisen Volcano has erupted exclusively adakitic products since ca.1.0 Ma under this subduction regime. Although previous studies have revealed that the adakites of this arc were generated by melting of the subducted basaltic crust and incorporation of slab sediments, this model cannot simply explain the observed geochemical variations of the Daisen adakites. We determined chronologica...
#1Seyed Ali Mazhari (PNU: Payame Noor University)H-Index: 5
#2Urs Klötzli (University of Vienna)H-Index: 20
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Abstract New zircon U-Pb dating indicates widespread Cretaceous magmatism in the Kaboodan area which includes two distinct geological zones of Sabzevar and Taknar at the NE of Iran. The Cretaceous igneous rocks were formed during 99–75 Ma and are consist of various extrusive and intrusive groups. All igneous rocks of Kaboodan have geochemical characteristics indicative of an active continental arc setting and there is no genetic linkage between the extrusive and intrusive rocks. The extrusive ro...
#1Yue-Sheng Han (China University of Geosciences)H-Index: 2
#2M. Santosh (University of Adelaide)H-Index: 82
Last.Vinod O. Samuel (Yonsei University)H-Index: 4
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Abstract The post-collisional ultramafic intrusions within the northern margin of the North China Craton (NCC) preserve important imprints of crust-mantle interaction. Here we investigate ultramafic intrusions from the Luojianggou complex composed of pyroxenite and hornblendite associated with serpentine, with a view to gain insights into the nature of orogenic lithospheric mantle in this major continental collision zone. Zircon U Pb data from the ultramafic suite define different age population...
#1D.J. Cherniak (RPI: Rensselaer Polytechnic Institute)H-Index: 1
#2E.B. Watson (RPI: Rensselaer Polytechnic Institute)
Abstract Diffusion of Ca has been characterized in natural K-feldspar under dry, 1 atm conditions using a 44Ca tracer. Polished sections of feldspar were surrounded by source powders in Pt capsules and annealed in air, or with solid buffers to buffer at NNO or IW. One hydrous experiment was conducted in a piston-cylinder device at 800 °C and 1 GPa. In all cases, the source of diffusant was pre-synthesized anorthitic powder doped with 44Ca. Prepared sample capsules were held at run conditions for...
#1Jin-Xiang Li (CAS: Chinese Academy of Sciences)H-Index: 15
#2Weiming Fan (CAS: Chinese Academy of Sciences)H-Index: 57
Last.Kyaing SeinH-Index: 3
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Abstract Subduction of the Indian continental lithosphere in the eastern Tibet-Himalaya orogenic belt remains unclear. Newly reported zircon U-Pb ages in this study indicate that the Shangalon intermediate-felsic magmatic rocks in northern Myanmar formed at Eocene-Oligocene (~ 40–32 Ma). They have calc-alkaline to shoshonitic characteristics, LREE-enriched patterns, enrichments in LILE (e.g., Rb, Cs), and depletions in HFSE (e.g., Nb). Obviously, they show the higher initial Sr and lower Nd-Hf i...
#1Wen Su (CAS: Chinese Academy of Sciences)H-Index: 10
#2Esther M. Schwarzenbach (FU: Free University of Berlin)H-Index: 11
Last.Fei Chen (CAS: Chinese Academy of Sciences)
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Abstract A detailed petrographic, microstructural and geochemical investigation of pyrites from four eclogites / blueschists and their veins in the Tianshan (NW China) have revealed the occurrence of four types of pyrites: δ34S values of the pyrites range from −24.7 to +13.2‰, whereby three populations can be distinguished that have distinct δ34S ranges corresponding to different paragenetic stages. Py1 pyrite grains contain micro- to nanoscale inclusions of pyrrhotite, chalcopyrite, bornite, sp...
#1Nicholas W. Hayman (University of Texas at Austin)H-Index: 19
#2Matthew Rioux (UCSB: University of California, Santa Barbara)H-Index: 13
Last.Mark D. Schmitz (BSU: Boise State University)H-Index: 37
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Abstract IODP Hole 1256D penetrates a complete section of upper oceanic crust spread from the East Pacific Rise at a full rate of up to 220 mm/yr. Here we present U Pb zircon data from Hole 1256D gabbroic rocks using isotope dilution-thermal ionization mass spectrometry (ID-TIMS) and secondary ion mass spectrometry (SIMS). Three gabbro samples yielded Th-corrected weighted mean 206Pb/238U SIMS dates of 15.03 ± 0.14 Ma, 15.13 ± 0.35 Ma, and 15.23 ± 0.12 Ma. An ID-TIMS Th-corrected weighted mean 2...
#1Mattia L. Mazzucchelli (UNIPV: University of Pavia)H-Index: 6
#2Alessandro Reali (UNIPV: University of Pavia)H-Index: 32
Last.Matteo Alvaro (UNIPV: University of Pavia)H-Index: 14
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Abstract Mineral inclusions entrapped in other minerals may record the local stresses at the moment of their entrapment in the deep Earth. When rocks are exhumed to the surface of the Earth, residual stresses and strains may still be preserved in the inclusion. If measured and interpreted correctly through elastic geobarometry, they give us invaluable information on the pressures (P) and temperatures (T) of metamorphism. Current estimates of P and T of entrapment rely on simplified models that a...
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