http://nopr.niscpr.res.in/handle/123456789/42742 2026-08-16T17:13:31Z http://nopr.niscpr.res.in/handle/123456789/42769 Title: A review on the distribution of Phylum Phoronida from India with recent observations on <em>Phoronis psammophila</em> Authors: Mulik, Jyoti; Emig, Christian C.; Sukumaran, Soniya Abstract: Phoronida is one of the smallest and least familiar phyla. A brief review on the distribution of Phylum Phoronida from India along with current observations on <em>Phoronis psammophila </em> is presented in this article. The aim of the study is to document the records of phoronids from Indian coast. Page(s): 1941-1943 2017-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/42768 Title: Relict benthic foraminifera in surface as well as sub-surface sediment off Gopalpur- Palur, Odisha: Indicator of sea level changes Authors: Tripathi, Sachin Kumar; Sarath, L.G. Abstract: A conceptual frame work was proposed based on the occurrence of relict foraminiferal assemblage and soft coral sclerites at different water depth between 60, 70 to 100 m, explain the sea level variation during different times in the geological past. Faunal ecology and presence of relict sand body at different isobaths suggests an episodic sea level rise in this region. Page(s): 1945-1949 2017-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/42767 Title: Dating of zircon LA-MC-ICP-MS U-Pb in metabasalt of zhaertai group, Inner Mongolia, China Authors: Song, Zhaojun; Meng, Fanxue; Li, Haifeng; Yuan, Xinyu; Li, Xuping; Xu, Qinglin Abstract: Present study consists on the sedimentation age of the Mesoproterozoic Zhaertai Group exposed along the northern margin of the North China Craton using zircon ages. The results showed that the Th/U of zircon varied greatly, from 0.20 to 1.77. Also, the mean ages of the two Concordia Groups of ²⁰⁶Pb/²³⁸U were 2503.1 ± 2.6Ma (n = 20, MSWD = 1.6), and 1688.0 ± 11Ma (n = 8, MSWD = 1.5), respectively. The age of 2503.1 ± 2.6Ma indicated that the zircon originated from the basement rock, in the underlying late Archean to the early Paleoproterozoic era. The group age of approximately 1688.0 ± 11Ma indicated that the Zhaertai Group underwent a magma accident at approximately 1.7 Ga, which may had some connection with North China’s continental cracking event at approximately1850 to 1650Ma. That is to say, the North China Craton’s stretch tectonic regime led to non-orogenic magma incidents in the Zhaertai Group at the northern margin of the North China Craton before 1688.0 ± 11Ma.  Metabasalt zircons of approximately 1688.0 ± 11Ma also revealed that the sedimentary age of the Zhaertai Group may be approximately 1.7 Ga, and the Zhaertai, Baiyun Obo, and Huade Groups should be considered to be contemporary sedimentary. Page(s): 1950-1958 2017-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/42766 Title: Mineralogical study on the magmatic rock in Cishan gold deposit, Tongling, China Authors: Li, Mingxuan; Du, Yangsong; Dongqian; Tu, Wei; Yu, Xiaoliang Abstract: Present study consists the major and trace elements in minerals of clinopyroxene and zircon in the Baimangshan pluton using electron probe and in-situ LA-ICP-MS. The results reflect that the Baimangshan pluton is a transitional rock type from subalkaline series to alkaline series and may have developed at a transition setting, from active continental margin to intraplate tectonics. Parent magma is the underplating mantle-derived basaltic magma having similar composition to ocean island basalt(OIB). And the zircons were crystallized from the lower crust in which the basaltic magmas were less differentiated. Baimangshan pluton is an oxidation pluton. It is high in alkali, which is favorable for forming oxidation type skarn gold deposits. Magma may be the main source of the mineral matters. Page(s): 1959-1967 2017-10-01T00:00:00Z