Two‐stage magmatism and mineralization of Tulaergen nickel‐copper deposit in eastern Tianshan, North‐west China: Evidence from bulk rock geochemistry and in situ mineral chemistry

2021 ◽  
Author(s):  
Lin‐Ru Fang ◽  
Dong‐Mei Tang ◽  
Malte Junge ◽  
Ke‐Zhang Qin ◽  
Ya‐Jing Mao ◽  
...  
Keyword(s):  
Copper Deposit ◽  
Mineral Chemistry ◽  
Bulk Rock ◽  
Two Stage ◽  
West China ◽  
Eastern Tianshan ◽  
North West ◽  
Nickel Copper

Paleozoic Magmatism and Mineralization Potential of the Sanchakou Copper Deposit, Eastern Tianshan, Northwest China: Insights from Geochronology, Mineral Chemistry, and Isotopes

2021 ◽  
Author(s):  
Fang-Fang Zhang ◽  
Yin-Hong Wang ◽  
Jia-Jun Liu ◽  
Chun-Ji Xue ◽  
Jian-Ping Wang ◽  
...  
Keyword(s):  
Late Stage ◽  
Secondary Ion Mass Spectrometry ◽  
Copper Deposit ◽  
High Water ◽  
Mineral Chemistry ◽  
Northwest China ◽  
Magma Ascent ◽  
Eastern Tianshan ◽  
Magmatic Arc ◽  
Mineralization Potential

Abstract The Sanchakou Cu deposit is located in the eastern section of the Dananhu magmatic arc in the Eastern Tianshan orogenic belt, northwest China. Sanchakou is hosted by quartz diorite and granodiorite intrusions. Chalcopyrite and bornite are the dominant ore minerals and occur as disseminations, patches, veins, and veinlets. Secondary ion mass spectrometry (SIMS) U-Pb dating of zircons shows that the ore-bearing intrusions were emplaced at ca. 435–432 Ma, recording the early subduction of the Paleo-Tianshan oceanic plate. The enrichment in large ion lithophile elements (LILEs), depletion in high field strength elements (HFSEs), and moderate Mg# values, together with mantle-like bulk Sr-Nd and zircon Hf-O isotope signatures (δ18O = 4.0–5.3‰), suggest that they were generated from partial melting of metasomatized mantle materials by subducted slab fluids. In situ S and whole-rock Pb isotope results imply that the Sanchakou diorite magmas provided ore-forming components (S and metals), with additional minor metals (e.g., Cu and Pb) sourced from crustal components beneath the Dananhu arc. The redox state of diorite magmas ranges from initial high fO2 (>FMQ + 2, where FMQ is the fayalite-magnetite-quartz buffer) to relatively low fO2 (<FMQ + 2) upon magma ascent and cooling. The late-stage less oxidized magma compositions are consistent with the presence of magmatic sulfides in primary plagioclase and magnetite. Estimates of water-sulfur-chlorine contents in magma using plagioclase, amphibole, and apatite compositions reveal that the diorite magmas had high water (>7 wt %), normal S (8–393 ppm), and systematically low Cl (38–1,100 ppm) contents. A constant and favorable elevated magma oxidation state appears critical for generating an economic porphyry Cu deposit. Additionally, Cl melt concentrations may be a key factor that controlled metal fertility of the deposits in the Eastern Tianshan, although the mineralization potential may also relate to depth of emplacement of the hydrothermal system. The anomalous presence of stellerite with chalcopyrite in late-stage veins indicates that original porphyry-style mineralization at Sanchakou underwent deformation-related modification after its formation.

TBE in China

2020 ◽  
Keyword(s):  
Western China ◽  
Ixodes Persulcatus ◽  
West China ◽  
North West ◽  
Haemaphysalis Concinna ◽  
Viral Subtype ◽  
Japanese Military ◽  
Natural Foci ◽  
Far Eastern ◽  
The Brain

The first TBE patients in China were reported in 1943, and the TBEV was isolated from the brain tissues of 2 patients in 1944 by Japanese military scientists,1 and from patients and ticks (Ixodes persulcatus and Haemaphysalis concinna) in 1952 by Chinese researchers.2 The Far Eastern viral subtype (TBEV-FE) is the endemic subtype that has been isolated from all 3 known natural foci (northeastern China, western China, and southwestern China).14 Recently a new “Himalayan subtype” of the TBEV (TBEV-HIM) was isolated from wild rodent Marmoata himalayana in the Qinghai-Tibet Plateau15. The main vector of the TBEV in China is I. persulcatus.3 One recent report suggests that the TBEV-SIB is prevalent in the Uygur region (North West China)13 but epidemiological modelling indicates that the TBEV may occur even widely all over China (Figure 3).4 Likely, the disease is often missed by clinicians due to a lack of the availability of specific diagnostic assays16.

Haloechinothrix aidingensis sp. nov., an actinomycete isolated from salt lake in Xinjiang province, north-west China

2021 ◽  
Author(s):  
Li Yang ◽  
Ya-Rong Kou ◽  
Tong-Wei Guan ◽  
Min Yin ◽  
Bing-Bing Liu ◽  
...  
Keyword(s):  
Salt Lake ◽  
West China ◽  
North West

Long-term vegetation restoration promotes the stability of the soil micro-food web in the Loess Plateau in North-west China

CATENA ◽  
2021 ◽  
Vol 202 ◽  
pp. 105293
Author(s):  
Yang Wu ◽  
WenJing Chen ◽  
Wulan Entemake ◽  
Jie Wang ◽  
HongFei Liu ◽  
...  
Keyword(s):  
Food Web ◽  
Loess Plateau ◽  
Vegetation Restoration ◽  
The Loess Plateau ◽  
West China ◽  
North West ◽  
The Stability

Dunhuang scrolls: Innovative storage solutions at the British Library

IFLA Journal ◽  
2021 ◽  
pp. 034003522110237
Author(s):  
Paulina Kralka ◽  
Marya Muzart
Keyword(s):  
Research Library ◽  
British Library ◽  
West China ◽  
North West ◽  
Lotus Sutra ◽  
Storage Solutions ◽  
Storage Facilities

The British Library’s Stein collection contains about 14,000 scrolls, fragments and booklets in Chinese from a cave in the Buddhist Mogao Caves complex near Dunhuang in north-west China. This article describes storage and access solutions for the collection in the context of a busy research library and the currently ongoing Lotus Sutra Manuscripts Digitisation project. The article presents the various technical and organisational challenges that its rehousing presents to the library conservators. Restricted by the existing storage facilities, budget limitations and tight project deadlines, the conservators must provide housing that is adequate for the scroll format, is practical and prevents dissociation, but is also cost- and time-effective. With the best storage practice in mind, they have developed original solutions, balancing the specific housing requirements and constraints. These storage solutions allow the conservators to ensure the long-term safety and accessibility of the collection while laying down a foundation of standardisation that will ensure a homogeneity of approaches for future projects.

Late Pleistocene hydroclimatic variabilities in arid north‐west China: geochemical evidence from Balikun Lake, eastern Tienshan, China

2021 ◽  
Vol 36 (3) ◽  
pp. 415-425
Author(s):  
Yongtao Zhao ◽  
Cheng‐Bang An ◽  
Aifeng Zhou ◽  
Xiaonan Zhang ◽  
Jiaju Zhao ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
West China ◽  
North West ◽  
Geochemical Evidence
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