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| 1 | Calcium isotope fractionation and its controlling factors over authigenic carbonates in the cold seeps of the northern South China Sea显示文摘In this study, we analyzed stable calcium isotope results of authigenic carbonates from two cold seep areas of the Dongsha area and the Baiyun Sag in the northern South China Sea. The stable isotopes of carbon and oxygen as well as the mineral composition of authigenic carbonates were used to investigate control calcium isotope fractionation. The δ44/40Ca ratios of the southwestern Dongsha area samples ranged from 1.21‰ to 1.52‰ and the ratio of the Baiyun Sag sample was 1.55‰ of the SRM915a isotope standard. X-ray diffraction analysis showed that the carbonate samples consisted of dolomite, calcite and aragonite, with small amounts of high-Mg calcite and siderite. The δ13C values of the carbonates of the southwestern Dongsha area varied between δ49.21‰ and δ16.86‰ of the Vienna PeeDee Belemnite (VPDB) standard and the δ18O values ranged from 2.25‰ to 3.72‰ VPDB. The δ13C value of the Baiyun Sag sample was 2.36‰ VPDB and the δ18O value was 0.44‰ VPDB. The δ13C values of the carbonates of the southwestern Dongsha area revealed there is methane seeping into this area, with a variable contribution of methane-derived carbon. The sampled carbonates covered a range of δ13C values suggesting a dominant methane carbon source for the light samples and mixtures of δ13C values for the heavier samples, with possibly an organic or seawater carbon source. The δ18O values indicated that there is enrichment in 18O, which is related to the larger oxygen isotope fractionation in dolomite compared to calcite. The results of the Baiyun Sag sample exhibited normal seawater carbon and oxygen isotopic values, indicating that this sample is not related to methane seepage but instead to precipitation from seawater. The relatively high δ44/40Ca values indicated either precipitation at comparatively high rates in pore-water regimes with high alkalinity, or precipitation from an evolved heavy fluid with high degrees of Ca consumption (Raleigh type fractionation). The dolomite samples from the Dongsha area revealed a clear correlation between the carbon and calcium isotope composition, indicating a link between the amount and/or rate of carbonate precipitation and methane contribution to the bicarbonate source. The results of the three stable isotope systems, mineralogy and petrography, show that mineral composition, the geochemical environment of authigenic carbonates and carbon source can control the calcium isotope fractionation. | WANG ShuHong YAN Wen MAGALHAES H Vitor CHEN Zhong PINHEIRO M Luis GUSSONE Nikolaus | 2012 | Chinese Science Bulletin2012，57，11： | 4 |
| 2 | Cloning and expression of functional shikimate dehydrogenase from Mycobacterium tuberculosis H37Rv显示文摘 | Magalhaes M L B Pereira C P Basso L A | 2002 | Protein Expression and Purification2002，26，： | 2 |
| 3 | Hyalinzing trabecular tumor of the thyroid displaying neuroendocrine differentiation显示文摘 | Magalhaes J Sobrinho-Simoes M | 2004 | Virchows Arch2004，445，1： | 1 |
| 4 | Application of microbia-amylase in industry-A review显示文摘 | Souza P M Magalhaes P O | 2010 | Braz J Microbiol2010，41，： | 1 |
| 5 | Diag- nosis of human herpesvirus 6B primary infection by pol- ymerase chain reaction in young children with exanthe- matic disease 显示文摘 | Magalhaes Ide M Martins RV Vianna RO | 2011 | Rev Soc Bras Med Trop2011，44，3： | 1 |
| 6 | Mi- crocystins (cyanobacteria hepatotoxins) bioaccumula- tion in fish and crustaceans from Sepetiba Bay (Brasil, RJ) 显示文摘 | Magalhaes V F Marinho M M Domingos P | 2003 | Toxicon2003，42，3： | 1 |
| 7 | Non-enzymatic browning in clarified cashew apple juice during thermal treatment:kinetics and process control显示文摘 | DAMASCENO L F FERNANDES FAN MAGALHAES M | 2008 | Food Chemistry2008，106，1： | 1 |
| 8 | Expression of GLUT-1 glucose transporter in borderline and malignant epithelial tumors of the ovary 显示文摘 | Cantuaria G Magalhaes A Penalver M | 2000 | Gynecol Oncol2000，79，1： | 1 |
| 9 | Research ethics in animal models显示文摘 | Miziara I D Magalha es A T Santos M d | 2012 | Braz J Otorhinolaryngol2012，78，2： | 1 |
| 10 | Copper and zincin vineyards of central Portugal显示文摘 | Magalhaes M J Sequeira E M Lucas M D | 1985 | Water Air and Soil Pollution1985，26，： | 1 |
| 11 | Clinicopathological study of 35 cases of multiple system atrophy显示文摘 | Ben-Shlomo Y Magalhaes M | 1995 | J Neurol Neurosurg Psychiatry1995，58，2： | 1 |
| 12 | A hy- brid genetic algorithm for the job shop scheduling problem显示文摘 | Goncalves J F de Magalhaes Mendes J J Resende M G C | 2005 | European Journal of Operational Research2005，167，1： | 1 |
| 13 | Antimicrobial activity of rhamnolipids against Listeria monocytogenes and their synergistic interaction with nisin显示文摘 | Magalhaes L Nitschke M | 2013 | Food Control2013，29，1： | 1 |
| 14 | Temporal and spatial patterns of intertidal sediment-water nutrient and oxygen fluxes in the Doure River estuary,Portugal显示文摘 | MAGALHAES C M BORDALO A A WIEBE W J | 2002 | Marine Ecology Progress Series2002，233，： | 1 |
| 15 | Molecular analysis of metallo-beta-lactamase gene bla ( SPM-1 )-surrounding sequences from disseminated Pseudomonas aeruginosa isolates in Recife,Brazi显示文摘 | Poirel L Magalhaes M Lopes M | 2004 | Antimicrob Agents Chemother2004，48，： | 1 |
| 16 | Inspira' s CPV sun tracking(concentrator photovohaics) 显示文摘 | Heredia I L Meoreno J M Magalhaes P H | 2007 | Springer2007，，13： | 1 |
| 17 | Morfologia do tubo digest6rio da tartaruga verde (Chelonia mydas) 显示文摘 | MAGALHAES M S FREITAS M D L SILVAE N B D | 2010 | Pesquisa Veterindria Brasileira2010，30，8： | 1 |
| 18 | Ambient vibration re-testing and operational modal a- nalysis of the Humber Bridge显示文摘 | Brownjohn J M W Magalhaes F Caetano E | 2010 | Engineering Struc- tures2010，32，8： | 1 |
| 19 | Synthe- sis and application of a functionalized resin for flow in- jection/F AAS copper determination in waters显示文摘 | Cassella R J Magalhaes O I B Couto M T | 2005 | Talan- ta2005，67，12： | 1 |
| 20 | Characterization of zirconized silica supports for HPLC显示文摘 | Faria A M Magalhaes D R Collins K E | 2005 | Analytica Chimica Acta2005，550，1： | 1 |
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