Xiaohan Gong

• Doctor of Philosophy
• China University of Geosciences (Beijing)

With the rapid development and wide use of fuel cells and scandium (Sc)-aluminum (Al) alloy, the demand for Sc may increase significantly in the future. Due to the lack of independent deposits, Sc is mainly derived from comprehensive utilization at present, which may cause a potential resource risk for the green economy in the future. It has been r...

This paper reports lithium concentrations and isotopic compositions of olivines in the oceanized subcontinental lithospheric mantle (SCLM) peridotites of the Tibetan Yunzhug ophiolite. The results show systematic Li isotope changes with distance from the rim of olivine grains. δ⁷Li values of olivine in dunites decrease from + 10.46 to + 1.33‰ with...

The long-lived accretion of the southwestern Central Asian Orogenic Belt is directly related to the subduction and demise of multiple Paleozoic oceanic basins. However, the evolution of those different oceans, and their relationships, remain poorly constrained. In this paper, we report on an Early Cambrian ophiolite discovered in the North Tianshan...

Ferromanganese nodules are a potential energy resource because of their high contents of economically interesting elements (i.e. Mn, Ni, Cu, and Zn). These are higher in diagenetic layers than in hydrogenetic layers. The study of the causes of elemental accumulation in the diagenetic layer is useful for the exploration metal-rich nodules. A diagene...

The accretion and evolution of oceanic lithosphere beneath back-arc spreading ridges remain less understood compared with mid-oceanic ridges (MOR). Here, we investigate mantle peridotites and gabbros recovered from the southernmost side of the Parece Vela back-arc basin, Philippine Sea. The peridotites contain multiple types of clinopyroxenes (Cpx)...

Ophiolites from the Bangong–Nujiang Suture Zone in the central part of the Tibetan Plateau represent relics of Neo-Tethyan oceanic lithosphere. Here we present the results of a detailed mineralogical and Os isotopic study of mantle peridotites of the Amdo ophiolite, which provide new insights into the origin of the peridotites and their diverse mel...

Ophiolites within the South Tianshan orogenic belt directly record the nature and tectonic evolution of the South Tianshan Ocean (STO), which is key for understanding the accretionary history of the Central Asian Orogenic Belt. Here we present petrological and Os isotopic data for the Wuwamen mantle peridotites from the South Tianshan orogenic belt...

The study of Carboniferous magmatism in northern West Junggar plays an important role in understanding the tectonic evolution of that part of the Central Asian Orogenic Belt. In this study, we present petrology, zircon U–Pb geochronology, mineral and whole-rock geochemistry, and the Sr–Nd–Hf–Pb isotope compositions of volcanic rocks from the Hamutu...

Garnet-bearing peridotites commonly occur in the deeper parts of mature or thickened oceanic lithosphere, and are rarely exhumed and emplaced onto the seafloor. The Purang ophiolitic peridotites in south Tibet contain rare symplectite pseudomorphs after garnet, offering a unique window into the still poorly understood evolution of the deep oceanic...

The Yunzhug ophiolite, in the middle sector of the Shiquanhe-Namco ophiolite belt (SNOB), has generally been interpreted as a remnant of the Neo-Tethyan oceanic lithosphere, composed of mantle peridotites and mafic-ultramafic magmatic rocks. However, detailed study reveals that the mantle parts are ultra-depleted peridotites with affinities to subc...

Ophiolites commonly sample the uppermost parts (15–20 km) of fossil oceanic lithosphere. However, in recent years, the documentation of diamonds, super‐reducing (e.g., SiC), and other “unusual” minerals from several ophiolitic peridotites and chromitites (e.g., Tibet and the Polar Urals) has caused debate concerning their origin (i.e., deep vs. sha...

The time duration and evolution of the major North Tianshan Ocean (also the Junggar Ocean) in the Chinese Tianshan orogenic collage remain poorly constrained. Here we report new geochronological and geochemical data of Carboniferous volcanic rocks documented from the North Tianshan accretionary complex in the Gangou area (Xinjiang, NW China). The s...

The Tianshan Belt, which lies in the southwest part of Central Asian Orogenic Belt (CAOB), is characterized by abundant ophiolites or ophiolitic mélanges, which are indicators of the existence of oceanic basin can be used for tracking the tectonic evolutionary history of the orogen. The Bindaban (BD) ophiolitic mélange is located in the Central Tia...

The scale and extent of isotopic heterogeneities in the Paleo-Asian oceanic mantle remain poorly constrained. Here, we report Os isotopic data for mantle peridotites from the Paleozoic Gangou and Kumishi ophiolites, which are preserved in the western Chinese Tianshan sutures (Xinjiang, China) and considered to sample the Paleo-Asian oceanic upper m...

During the latest Carboniferous to Early Permian, a possible mantle plume initiated continental rifting along the northern Gondwana margin, which subsequently developed into the Meso‐Tethys Ocean. However, the nature and timing of the embryonic oceanic crust of the Meso‐Tethys Ocean remain poorly understood. Here we present for the first time a com...

Widespread but small-volume Late Cretaceous volcanic rocks in central Tibet contain important information on the Lhasa–Qiangtang collision process. In this contribution, we focus on Late Cretaceous volcanics in the southern Qiangtang subterrane, and present zircon LA–ICP–MS U–Pb ages, whole-rock major and trace element compositions, and Sr–Nd isoto...

There is a Mid–Late Mesozoic (Jurassic–Cretaceous) arc magmatic belt in southern Qiangtang subterrane associated with the north-dipping subduction of the Bangong–Nujiang Tethyan Ocean. Early Mesozoic (Triassic) magmatism, tectonic evolution of the southern Qiangtang subterrane, and the mechanism of its crustal growth, however, remain unclear. This...

Ophiolites in the Indus-Yarlung Zangbo (IYZ) suture (southern Tibet) have been interpreted as remnants of the Neo-Tethyan lithosphere. However, the discovery of diamonds and super-reducing, ultra-high pressure (SuR-UHP) mineral assemblages (e.g., coesite after stishovite, olivine after wadsleyite, native metals, alloys, and moissanite) in some of t...

Large peridotite massifs are scattered along the 1500 km length of the Yarlung–Zangbo Suture Zone (southern Tibet, China), the major suture between Asia and Greater India. Diamonds occur in the peridotites and chromitites of several massifs, together with an extensive suite of trace phases that indicate extremely low fO2 (SiC, nitrides, carbides, n...

We present high-precision measurements of iron (Fe) and magnesium (Mg) isotopic compositions of olivine, orthopyroxene and chromite separates from harzburgites, dunites and chromitites in the mantle section of the Luobusa ophiolite, southern Tibet, to investigate the origins of podiform chromitite. Two harzburgites in the Zedong ophiolite, southern...

A major debate related to the evolution of the Tibetan Plateau is centered on whether or not an island arc-back-arc basin system occurred along the Bangong-Nujiang suture zone, central Tibet. Here we present new zircon U-Pb geochronology, rare earth elements (REE) and bulk-rock geochemistry of these magmatic rocks in the Amdo area, the middle Bango...

Voluminous Early Cretaceous volcanic rocks from the northern and central Lhasa subterranes contain important information on the tectono-magmatic processes. In this contribution, we focus on the Lower Cretaceous volcanic rocks in the Nagqu area, northern Lhasa subterrane, and present their zircon LA-ICP-MS U-Pb ages, in situ Hf isotopic data, whole-...

The Amdo terrane holds one of the important keys to understand the tectonic evolution of Central Tibet. Here we report the results from a combined study of Cathodoluminescence imaging, LA-ICPMS U-Pb dating, and trace element analysis of zircons from high-pressure (HP) mafic granulites from the Amdo terrane. Zircons from the mafic granulite are roun...

It is essential to obtain precise Os isotopic composition of convecting upper mantle before the application of Re-Os isotope system. However, published estimates for convecting upper mantle, especially calculation from mantle peridotites, are hindered by ubiquitous mantle heterogeneity. Given the ancient refractory domains contribute little to MORB...

Mantle peridotites, originated from sub-continental, sub-arc or sub-ridge mantle lithosphere, commonly occur in orogenic belts as Alpine-type peridotites or members of ophiolites through tectonic emplacement, or exist in the volcanic rocks as xenoliths. In this paper, we compared the petrological, geochemical, isotopic characteristics of the mantle...

The Shangcang Permian pillow basalts in Yunnan Province crop out on the bottom of the inner zone of the Emeishan Large Igneous Province(ELIP). They are belong to tholeiitic series with SiO2 contents between 49.36% and 51.36%, 1.28%~1.91% for TiO2, 13.91%~16.31% for Al2O3, 6.08%~10.79% for MgO, with Mg#[100 × Mg/(Mg+Fe)] of 53~69, and the Na2O conte...