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The Panzhihua layered intrusion in the ~260Ma Emeishan large igneous province is composed of melagabbro and Fe–Ti oxide ore bodies in the lower zone (LZ) and the lower part of the middle zone (MZa), and Fe–Ti oxide-poor leucogabbro in the upper part of the middle zone (MZb) and upper zone (UZ). Cumulus apatite grains occur in the ~500- to 600-m-thick MZb, which makes up 25–30% of the ~2-km-thick intrusion...
The Baima mafic–ultramafic layered intrusion of the 260-Ma Emeishan Large Igneous Province (ELIP) hosts the second largest Fe–Ti–(V) oxide deposit in the Panxi region, SW China. It is a ~1600-m-thick layered body intruded by slightly younger syenitic and granitic plutons. The intrusion includes the Lower and Upper Zones. Troctolite and olivine pyroxenite of the Lower Zone contains conformable oxide...
The early Cretaceous Fangcheng basalts were erupted in the peak stage of lithospheric thinning of the North China Craton (NCC). They have olivine phenocrysts with forsterite (Fo) contents ranging from 74 to 92, clinopyroxene with high Mg# from 76 to 89, and contain pyroxenite xenoliths. Both the basalts and pyroxenite xenoliths have coexisting high-Ca and low-Al clinopyroxene and high-Mg and low-Ca...
Cenozoic continental basalts from east-central China were analyzed for their whole-rock major and trace elements as well as Sr–Nd–Hf–Pb and O isotopes. An integrated interpretation of all the results is used to place tight constraints on the nature of mantle source. The basalts are alkaline in lithochemistry and show the OIB-like patterns of trace element distribution. Their radiogenic isotopic compositions...
Zircon U–Pb ages and geochemical data are reported for the Piqiang oxide-bearing ultramfic–mafic complex, the Bachu mafic dyke swarm, the Yingan and Kaipaizileike basalts and the Halajun A-type granites in the Tarim Block, Northwest China. The Piqiang complex and the Halajun A-type granites were emplaced at ca. 276Ma and ca. 278Ma, respectively. Together with previously reported geochronological data,...
The ~260Ma Jinbaoshan sill is part of the Permian Emeishan large igneous province in SW China and is mainly composed of wehrlite and hosts a PGE deposit containing ~45tonnes of Pt and Pd with ore grades ranging from 1 to 5ppm Pt+Pd. The sill is composed of several PGE-rich horizons at different stratigraphic heights. A ~5m-thick PGE-rich horizon at the base of the sill, which is underlain by a chromite-rich,...
In the Panzhihua–Xichang region (Sichuan Province, SW China), there are a number of world-class magmatic Fe–Ti oxide deposits. They are hosted as conformable masses in lower parts of layered mafic–ultramafic intrusions that are part of the end-Guadalupian (∼260Ma) Emeishan large igneous province. The ore-bearing Panzhihua, Hongge, Baima, Taihe and Xinjie intrusions are spatially and temporally associated...
The ~260-Ma Emeishan large igneous province in SW China and northern Vietnam contains low-Ti tholeiitic basalts, high-Ti alkaline basalts and minor peralkaline volcanic rocks. The flood basalts in Longzhoushan, Sichuan Province, SW China, comprise four units, each of which has volcanic breccia at the base. From the base upward, rocks of Units 1 and 2 are high-Ti basalts with relatively high MgO (7...
The Late Middle Permian (∼260 Ma) Emeishan large igneous province in SW China contains two magmatic series, one comprising high-Ti basalts and Fe-rich gabbroic and syenitic intrusions, the other low-Ti basalts and mafic–ultramafic intrusions. The Fe-rich gabbros are spatially and temporally associated with syenites. Each series is associated with a distinctive type of mineralization, the first with...
The ∼260 Ma Xinjie mafic–ultramafic intrusion in the Emeishan large igneous province, SW China, is a sill-like body hosting Fe–Ti–Cr oxide mineralization. The intrusion comprises, from the base upward, a marginal zone and three cyclic zones. Fe–Ti oxides (magnetite and ilmenite) are disseminated throughout the intrusion and the oxide mineralization includes several Fe–Ti oxide-rich layers. The oxides...
The Jinbaoshan ultramafic intrusion is a member of the late–middle Permian (260 Ma) Emeishan Large Igneous Province in Yunnan Province, SW China and hosts an economical Pt–Pd–sulphide deposit. The intrusion consists mainly of wehrlite (92 vol.%), with minor olivine clinopyroxenite and clinopyroxenite (8 vol.%). The ores, defined as rocks having >0.5 ppm Pt and Pd, contain abundant chromite (up...
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