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Discovery of the Plagiogranites in the Diyanmiao Ophiolite, Southeastern Central Asian Orogenic Belt, Inner Mongolia, China and Its Tectonic Significance
Yingjie LI,
Jinfang WANG,
Genhou WANG,
Peipei DONG,
Hongyang LI,
Xiaojia HU,
Corresponding Author
Yingjie LI
School of Nature Resources, Hebei GEO University, Shijiazhuang 050031 China
Corresponding author. E-mail: [email protected]Search for more papers by this authorJinfang WANG
School of Nature Resources, Hebei GEO University, Shijiazhuang 050031 China
Search for more papers by this authorGenhou WANG
School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083 China
Search for more papers by this authorPeipei DONG
School of Nature Resources, Hebei GEO University, Shijiazhuang 050031 China
Search for more papers by this authorHongyang LI
School of Nature Resources, Hebei GEO University, Shijiazhuang 050031 China
Search for more papers by this authorXiaojia HU
Tianjin Institute of Geology and Mineral Resources, Tianjin 300170 China
Search for more papers by this authorYingjie LI,
Jinfang WANG,
Genhou WANG,
Peipei DONG,
Hongyang LI,
Xiaojia HU,
Corresponding Author
Yingjie LI
School of Nature Resources, Hebei GEO University, Shijiazhuang 050031 China
Corresponding author. E-mail: [email protected]Search for more papers by this authorJinfang WANG
School of Nature Resources, Hebei GEO University, Shijiazhuang 050031 China
Search for more papers by this authorGenhou WANG
School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083 China
Search for more papers by this authorPeipei DONG
School of Nature Resources, Hebei GEO University, Shijiazhuang 050031 China
Search for more papers by this authorHongyang LI
School of Nature Resources, Hebei GEO University, Shijiazhuang 050031 China
Search for more papers by this authorXiaojia HU
Tianjin Institute of Geology and Mineral Resources, Tianjin 300170 China
Search for more papers by this authorAbout the first author:
LI Yingjie, female, born in 1976 in Jining City, Shandong Province; doctor; graduated from China University of Geosciences, Beijing; associate professor of School of Nature Resources, Hebei GEO University. She is now interested in the study on igneous rocks and tectonic environments. Email: [email protected]; phone: 0311-87207655, 15632364069.
Abstract
In this study, plagiogranites in the Diyanmiao ophiolite of the southeastern Central Asian Orogenic Belt (Altaids) were investigated for the first time. The plagiogranites are composed predominantly of albite and quartz, and occur as irregular intrusive veins in pillow basalts. The plagiogranites have high SiO2 (74.37–76.68wt%) and low Al2O3 (11.99–13.30wt%), and intensively high Na2O (4.52–5.49wt%) and low K2O (0.03–0.40wt%) resulting in high Na2O/K2O ratios (11.3–183). These rocks are classified as part of the low-K tholeiitic series. The plagiogranites have low total rare earth element contents (ΣREE)(23.62–39.77ppm), small negative Eu anomalies (δEu=0.44–0.62), and flat to slightly LREE-depleted chondrite-normalized REE patterns ((La/Yb)N=0.68–0.76), similar to N-MORB. The plagiogranites are also characterized by Th, U, Zr, and Hf enrichment, and Nb, P, and Ti depletion, have overall flat primitivemantle-normalized trace element patterns. Field and petrological observations and geochemical data suggest that the plagiogranites in the Diyanmiao ophiolite are similar to fractionation-type plagiogranites. Furthermore, the REE patterns of the plagiogranites are similar to those of the gabbros and pillow basalts in the ophiolite. In plots of SREE–SiO2, La–SiO2, and Yb–SiO2, the plagiogranites, pillow basalts, and gabbros show trends typical of crystal fractionation. As such, the plagiogranites are oceanic in origin, formed by crystal fractionation from basaltic magmas derived from depleted mantle, and are part of the Diyanmiao ophiolite. LA–ICP–MS U–Pb dating of zircons from the plagiogranites yielded ages of 328.6±2.1 and 327.1±2.1Ma, indicating an early Carboniferous age for the Diyanmiao ophiolite. These results provide petrological and geochronological evidence for the identification of the Erenhot–Hegenshan oceanic basin and Hegenshan suture of the Paleo-Asian Ocean.
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