The role of continental fragments in the formation of intra-oceanic arcs: Constraints from Sr-Nd-Hf-O isotopes of gabbro from the Jiamusi Block, NE China

2021 ◽  
Author(s):  
Hao Yang ◽  
Wen-Chun Ge ◽  
M. Santosh ◽  
Zheng Ji ◽  
Yu Dong ◽  
...  
Keyword(s):  
Ne China ◽  
O Isotopes

Geochemistry of ultrapotassic volcanic rocks in Xiaogulihe NE China: Implications for the role of ancient subducted sediments

Lithos ◽  
2014 ◽  
Vol 208-209 ◽  
pp. 53-66 ◽  
Author(s):  
Yang Sun ◽  
Jifeng Ying ◽  
Xinhua Zhou ◽  
Ji'an Shao ◽  
Zhuyin Chu ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Ne China

Mineralogy, fluid inclusions and S-Pb-H-O isotopes of the Erdaokan Ag-Pb-Zn deposit, Duobaoshan metallogenic belt, NE China: Implications for ore genesis

2019 ◽  
Vol 113 ◽  
pp. 103074 ◽  
Author(s):  
Mao-Wen Yuan ◽  
Lin Li ◽  
Sheng-Rong Li ◽  
Cheng-Lu Li ◽  
M. Santosh ◽  
...  
Keyword(s):  
Fluid Inclusions ◽  
Ne China ◽  
Ore Genesis ◽  
Metallogenic Belt ◽  
O Isotopes

Role of crustal and slab components in the Northern Volcanic Zone of the Andes (Ecuador) constrained by Sr–Nd–O isotopes

Lithos ◽  
2012 ◽  
Vol 132-133 ◽  
pp. 180-192 ◽  
Author(s):  
Silvana Hidalgo ◽  
Marie C. Gerbe ◽  
Hervé Martin ◽  
Pablo Samaniego ◽  
Erwan Bourdon
Keyword(s):  
Volcanic Zone ◽  
The Andes ◽  
O Isotopes ◽  
Northern Volcanic Zone

scholarly journals The origin of inner Solar System water

2017 ◽  
Vol 375 (2094) ◽  
pp. 20150384 ◽  
Author(s):  
Conel M. O'D. Alexander
Keyword(s):  
Solar System ◽  
Classical Model ◽  
Terrestrial Planet ◽  
Asteroid Belt ◽  
Carbonaceous Chondrites ◽  
Outer Solar System ◽  
Isotopic Compositions ◽  
O Isotopes ◽  
N Isotopes

Of the potential volatile sources for the terrestrial planets, the CI and CM carbonaceous chondrites are closest to the planets' bulk H and N isotopic compositions. For the Earth, the addition of approximately 2–4 wt% of CI/CM material to a volatile-depleted proto-Earth can explain the abundances of many of the most volatile elements, although some solar-like material is also required. Two dynamical models of terrestrial planet formation predict that the carbonaceous chondrites formed either in the asteroid belt (‘classical’ model) or in the outer Solar System (5–15 AU in the Grand Tack model). To test these models, at present the H isotopes of water are the most promising indicators of formation location because they should have become increasingly D-rich with distance from the Sun. The estimated initial H isotopic compositions of water accreted by the CI, CM, CR and Tagish Lake carbonaceous chondrites were much more D-poor than measured outer Solar System objects. A similar pattern is seen for N isotopes. The D-poor compositions reflect incomplete re-equilibration with H 2 in the inner Solar System, which is also consistent with the O isotopes of chondritic water. On balance, it seems that the carbonaceous chondrites and their water did not form very far out in the disc, almost certainly not beyond the orbit of Saturn when its moons formed (approx. 3–7 AU in the Grand Tack model) and possibly close to where they are found today. This article is part of the themed issue ‘The origin, history and role of water in the evolution of the inner Solar System’.

The late Neoarchean transition from low- to high-K granitoids in western Liaoning Province, NE China: Clues from geochemistry and zircon U–Pb–Hf–O isotopes

2019 ◽  
Vol 76 ◽  
pp. 224-245
Author(s):  
Yang Xu ◽  
Ali Polat ◽  
Xiang-Jun Meng ◽  
Yuan-Ku Meng ◽  
Xin Deng ◽  
...  
Keyword(s):  
Liaoning Province ◽  
Ne China ◽  
Western Liaoning ◽  
High K ◽  
O Isotopes

The chemical evolution from older (323–318 Ma) towards younger highly evolved tin granites (315–314 Ma)—sources and metal enrichment in Variscan granites of the Western Erzgebirge (Central European Variscides, Germany)

2020 ◽  
Author(s):  
Marion Tichomirowa ◽  
Axel Gerdes ◽  
Manuel Lapp ◽  
Dietmar Leonhardt ◽  
Martin Whitehouse
Keyword(s):  
Granulite Facies ◽  
Source Rocks ◽  
Metamorphic Rocks ◽  
Control Factor ◽  
Basement Rocks ◽  
Ore Bodies ◽  
O Isotopes ◽  
Variscan Granites ◽  
Highly Evolved

<p>The sources and critical enrichment processes for granite related tin ores are still not well understood. The Erzgebirge represents one of the classical regions for tin mineralization. We investigated the four largest plutons from the Western Erzgebirge (Germany) for the geochemistry of bulk rocks and autocrystic zircons and relate this information to their intrusion ages. The source rocks of the Variscan granites were identified as high-grade metamorphic rocks based on the comparison of Hf-O isotope data on zircons, the abundance of xenocrystic zircon ages as well as Nd and Hf model ages. Among these rocks, restite is the most likely candidate for later Variscan melts.</p><p>In contrast to previously published suggestions (Romer and Kroner, 2015; Wolf et al., 2018), we can exclude a substantial role of intense sedimentary weathering as an important control factor for later Sn and W enrichment in granite related ores of the Western Erzgebirge due to the remarkable homogeneous Hf and low O isotopes in granitic zircons that are extremely distinct to all pre-Devonian basement rocks of Saxothuringia. We document a source enrichment from meta-sedimentary rocks (575 Ma) towards metamorphic rocks (340 Ma) were restites from granulite-facies melts are enriched 6–7 times in Sn compared to UCC (upper continental crust). These rocks are also enriched in K, but depleted in Na and Ca, contain abundant muscovite, and are fertile for later melting. Further enrichment of Sn and W occurred during multiple melt production of the older igneous granites (323–318 Ma) leading finally to a general enrichment of Sn (15 times compared to UCC) in the tin granites (315-314 Ma). Multiple melt production did not lead to a very strong enrichment of ore metals in the granites but is probably very important for a general enrichment of Sn and W in the thick granite-rich crust of the Erzgebirge. Efficient leaching by hydrothermal fluids led to a very strong enrichment (up to several orders) of Sn and W in the greisen ore bodies.</p><p> </p><p>References:</p><p>Romer, R.L.; Kroner, U. Sediment and weathering control on the distribution of Paleozoic magmatic tin-tungsten mineralization. Mineral. Depos. 2015, 50, 327–338, doi:10.1007/s00126-014-0540-5.</p><p>Wolf, M.; Romer, R.L.; Franz, L.; Lopez-Moro, F.J. Tin in granitic melts: The role of melting temperature and protolith composition. Lithos 2018, 310–311, 20–30.</p>

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