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Petrochemistry and trace element geochemistry of the Besshi type Cu-Zn deposit at Faziba, SE Gansu, NW China
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
X. Song, Y. Guo, J. Xu, Qu. Xu
The Faziba Cu-Zn deposit occurs in the Middle-Upper Proterozoic volcanic-sedimentary rock series of the Bikou Group, which is exposed at the junction of the Qinling Fold System, the Yangtze Platform and the Songpan-Ganzi Fold System (Song et al., 1999). From the view of plate tectonics, this deposit was formed in a tectonic system related to subduction on the northwestern margin of the Yangtze Plate (Song et al., 1998). The volcanicsedimentary rock series of the Bikou Group, constituting the Yangba-Bikou Anticlinorium that is overturned northwards, can be subdivided into the following 5 rock formations from base to top: (1) Baiguoshu Formation, composed of silty phyllite, siliceous sericite phyllite, metabasalt and magnetite (hematite) quartzite; (2) Yangba Formation, composed of metabasalt, chlorite-epidote schist, metaandesite, chlorite-sericite phyllite and intercalations of magnetite (hematite) quartzite; (3) Guanzigou Formation, composed of metamorphosed acid tuffs, sericite phyllite, metabasalt and chloriteepidote schist; (4) Baiyang Formation, composed of metalitharenite, metaarkose, metaandesite-basalt, chlorite-epidote schist and sericite phyllite; (5) Yangtianba Formation, composed of metasandstone, silty slate, basal conglomerate and intercalations of metaconglomerate and sericite phyllite.
Geochemical properties of topsoil around the coal mine and thermoelectric power plant
Published in Journal of Environmental Science and Health, Part A, 2018
Trajče Stafilov, Robert Šajn, Mila Arapčeska, Ivan Kungulovski, Jasminka Alijagić
The oldest rocks in the Western Macedonian zone are Paleozoic age and consist of low metamorphic schists and granitic rocks. The most widespread granite is alkalic granite, extending in N-S direction. The oldest granitoid rocks are represented by biotic and amphibolitic granodiorites to which granosyenite and syenite are connected on the southern part of the Western Macedonian zone. Following the direction N-S, on the left side of the map, Silurian-Devonian formation occur composed of phyllite, slate, metasandstone and metaconglomerate which alter to some older Paleozoic rocks. Ordovician-Silurian greenschist and conglomerates with intrusions of quartz-sericite schist and schistose quartzite developed southern of Bitola. During Pliocene and Quaternary were first deposited the lacustrine sediments in the Pelagonian depression. They begin with Middle Pliocene gravels, sands and clays with coal beds, while the upper part is composed of poorly sorted gravel, sand and silty clays. Holocene is represented by diluvial and alluvial deposits.
Subduction erosion: contributions of footwall and hanging wall to serpentinite mélange; field, geochemical and radiochronological evidence from the Eocene HP-LT belt of New Caledonia
Published in Australian Journal of Earth Sciences, 2021
Although a large part of the Pouébo Terrane is only exposed in remote and rugged areas surrounding Mt Panié, and thus is poorly known, it seems that the amount of serpentinite matrix decreases along strike from northwest to southeast. Metasedimentary elements increase up to 50% in the Hienghène region where blocks of Maastrichtian black cherts are mixed with mafic blocks. In the southeasternmost known exposure of the Pouébo Mélange, at Anse Ponandu (4.5 km to the SSE of Touho village; Figure 1), the mélange contains mafic (EMORB) (Cluzel et al., 2001, this study) and metasedimentary rocks, which include metaconglomerate blocks identical to those of Upper Cretaceous Tendo Formation (see above) apparently without serpentinite matrix.
Lithostratigraphy of Paleozoic metasediments in southern Fiordland, New Zealand
Published in New Zealand Journal of Geology and Geophysics, 2023
Richard Jongens, Ian M. Turnbull, Andrew H. Allibone
Mafic volcaniclastic metasediments, mafic to felsic metavolcanics, subordinate psammite, minor metaconglomerate, and rare calc-silicate rock and marble in the Cameron Mountains are mapped as Kathryn Metavolcanics (Powell 2006), the structurally lowest formation in the Cameron Group. The most distinctive but volumetrically minor lithology is an 80 m thick band of porphyritic metadacite (Figure 4A). There is no complete type section but a well-exposed, though incomplete, reference section is nominated over Kathryn Peak from a minor fault at 1137790E 4914020N northwest to tarns at 1136150E 4915900N. The base of the unit is not seen; the top is sharply but conformably overlain by Sea View Psammite (Powell 2006).