http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hoang Thi Hong Anh,최성희,유용재,Pham Trung Hieu 한국지질과학협의회 2021 Geosciences Journal Vol.25 No.4
We present comprehensive geochemical and isotopic (Sr-Nd-Hf) datasets for two suites of ultramafic rock in Vietnam, namely xenoliths of spinel lherzolite entrained in late Cenozoic alkali basalts, and Paleozoic ultramafic massifs that occur along the Tam Ky–Phuoc Son suture zone in central and southern Vietnam. The ultramafic massifs are the products of high degrees of melt extraction (up to 40%), and have relatively low equilibrium temperatures of 603 to 778 °C. The lherzolites are residues of relatively low degrees of fractional melting (< 1% up to 20%). The compositions of minerals in the xenoliths reveal that the late Cenozoic lithospheric mantle beneath central and southern Vietnam was hotter (825–1058 °C) than during the Paleozoic. The calculated trace element patterns of metasomatic melts that equilibrated with clinopyroxenes in the LREE-enriched xenoliths show enrichments in Th, U, and LREEs, and depletions in Nb. These data, together with the elevated Ti/Eu ratios of the clinopyroxenes, reflect the role of hydrous silicate melts as the main agents of metasomatism. The ultramafic rocks of the Paleozoic massifs contain spinel with TiO2 contents higher than expected for residual spinel, which suggests the influence of boninitic melt(s). In the lherzolite xenoliths, the clinopyroxenes have MORB-like depleted Sr-Nd-Hf isotopic compositions (87Sr/86Sr = 0.70241–0.70416; εNd = +6.6 to 12.3; εHf = +13.1 to 25.1), suggesting metasomatic melts/fluids from upwelling asthenosphere. We suggest that subduction of the (Paleo-)Pacific Plate and continental collision during the Permian–Triassic played key roles in lithospheric replacement and thinning beneath central and southern Vietnam.
Hoang, Thi Hong Anh,Choi, Sung Hi,Yu, Yongjae,Pham, Trung Hieu,Nguyen, Kim Hoang,Ryu, Jong-Sik Elsevier 2018 Lithos Vol.296 No.-
<P><B>Abstract</B></P> <P>This study presents a comprehensive analysis of the major and trace element, mineral, and Sr, Nd, Pb and Mg isotopic compositions of late Cenozoic intraplate basaltic rocks from central and southern Vietnam. The Sr, Nd, and Pb isotopic compositions of these basalts define a tight linear array between Indian mid-ocean-ridge basalt (MORB)-like mantle and enriched mantle type 2 (EM2) components. These basaltic rocks contain low concentrations of CaO (6.4–9.7wt%) and have high Fe/Mn ratios (>60) and FeO/CaO–3MgO/SiO<SUB>2</SUB> values (>0.54), similar to partial melts derived from pyroxenite/eclogite sources. This similarity is also supported by the composition of olivine within these samples, which contains low concentration of Ca and high concentrations of Ni, and shows high Fe/Mn ratios. The basaltic rocks have elevated Dy/Yb ratios that fall within the range of melts derived from garnet lherzolite material, although their Yb contents are much higher than those of modeled melts derived from only garnet lherzolite material and instead plot near the modeled composition of eclogite-derived melts. The Vietnamese basaltic rocks have lighter δ<SUP>26</SUP>Mg values (−0.38±0.06‰) than is expected for the normal mantle (−0.25±0.07‰), and these values decrease with decreasing Hf/Hf* and Ti/Ti* ratios, indicating that these basalts were derived from a source containing carbonate material. On primitive mantle-normalized multi-element variation diagrams, the central Vietnamese basalts are characterized by positive Sr, Eu, and Ba anomalies. These basalts also plot within the pelagic sediment field in PbPb isotopic space. This suggests that the mantle source of the basalts contained both garnet peridotite and recycled oceanic crust. A systematic analysis of variations in geochemical composition in basalts from southern to central Vietnam indicates that the recycled oceanic crust (possibly the paleo-Pacific slab) source material contains varying proportions of gabbro, basalt, and sediment. The basalts from south-central Vietnam (12°N–14°N) may be dominated by the lowest portion of the residual slab that contains rutile-bearing plagioclase-rich gabbroic eclogite, whereas the uppermost portion of the recycled slab, including sediment and basaltic material with small amounts of gabbro, may be a major constituent of the source for the basalts within the central region of Vietnam (14°N–16°N). Finally, the southern region (10°N–12°N) contains basalts sourced mainly from recycled upper oceanic crust that is basalt-rich and contains little or no sediment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Vietnam basalts have Sr-Nd-Pb isotopic compositions defining a DMM-EM2 array. </LI> <LI> The mantle source is composed of garnet peridotite and recycled oceanic crust. </LI> <LI> Southern to central Vietnam can be divided into three geochemical mantle domains. </LI> <LI> Their light Mg isotopic compositions are likely inherited from recycled carbonates. </LI> <LI> The volcanism may be produced by Hainan plume, entraining the Paleo-Pacific slab. </LI> </UL> </P>
An overview bioactive compounds on the skin of frogs (Anura)
Tran Thi Huyen,Phan Thi Hoang Anh,Nguyen Thi Anh Hong,Nguyen Ngoc Duyen,Le Pham Tan Quoc,Tran Dinh Thang 한국수산과학회 2023 Fisheries and Aquatic Sciences Vol.26 No.4
The robust development of frog farming offered high economic benefits but created a large waste residue of frog bones and skin that received little attention. Over the years, inedible by-products have often been processed into biomolecules of potential value and environmental benefits, such as collagen, gelatin, and bioactive peptides. An overview of bioactive compounds on frog skins from various countries indicated that brevinin was the most abundant biological peptide found in frog skin. Other remaining compounds also possessed their highlighted activities, including antibacterial, stimulating insulin release and gastric hormone release, anti-cancer, and neuroregulatory. Notably, various components have been analyzed in the structure and sequence to give meaningful insight into clustering components related to their biological activity. This review may create a source of raw materials for the developmental research of by-products from frog skin and concomitantly reduce environmental pollution.