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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 | Immunotherapy for de novo renal transplantation :what's in the pipeline? 显示文摘 | TEDESCO SILVA H JR PINHEIRO MACHADO P ROSSO FELIPE C | 2006 | Drugs2006，66，13： | 1 |
| 3 | Photochemical responses and oxidative stress in the clones of Coffea canephora under water deficit conditions显示文摘 | Lima A L S DaMatta F M Pinheiro H A | 2002 | Environmental and Experimental Botany2002，47，23： | 1 |
| 4 | Photochemical responses and oxidative stress in two clones of Coffea canephora under water deficit conditions显示文摘 | LIMA A L S DAMATT F M PINHEIRO H A | 2002 | Environmental and Experimental Botany2002，47，： | 1 |
| 5 | Determination of Formaldehyde by Acetaldehyde in Urine by HPLC显示文摘 | Deandrade J B Deandrade M V Pinheiro H L C | 1999 | American Laboratory1999，31，10： | 1 |
| 6 | Embolisation of prostatic arteries as treatment of moderate to severe lower urinary symptoms(LUTS)secondary to benign hyperplasia:results of short-and mid-term follow-up 显示文摘 | Pisco JM Rio Tinto H Campos Pinheiro L | 2013 | Eur Radiol2013，23，： | 1 |
| 7 | Self-sustained phase shift modulated resonant converters:modeling,design,and performance显示文摘 | YOUSSEF M Z PINHEIRO H JAIN P K | 2006 | IEEE Transactions on Power Electronics2006，21，2： | 1 |
| 8 | Prevalence and mechanisms of erythromycin resistance in Streptococcus agalactiae from healthy pregnant women显示文摘 | Pinheiro S Radhouani H Coelho C | 2009 | Microb Drug Resist2009，15，2： | 1 |
| 9 | A space vector PWM modulation scheme for back-to-back three-level diode-clamped converters显示文摘 | Grigoletto F B Pinheiro H | 2009 | IEEE Transactions on Power Electronics Conference2009，，： | 1 |
| 10 | Drought tolerance in relation to protection against oxidative stress in clones of Coffea canephora subjected to long-term drought显示文摘 | Pinheiro H A DaMatta F M Chaves A R M | 2004 | Plant Science2004，167，6： | 1 |
| 11 | Drought tolerance in relation to protection against oxidat'ive stress inclones of Cojfea canephora subjected to long-term drought 显示文摘 | PINHEIRO H A DAMATTA F M CHAVES ARM | 2004 | Plant Science2004，167，： | 1 |
| 12 | Whole-cell biocatalysis in organic media 显示文摘 | Len R Femandes P Pinheiro H M | 1998 | Enzyme Microb Technol1998，23，： | 1 |
| 13 | Genetic deletion of the angiotensin (1 7) receptor Mas leads to glomerular hyperfiltration and microalbu minuria显示文摘 | Pinheiro S V Ferreira A J Kitten G T da Silveira K D da Silva D A Santos S H | 2009 | Kidney Int2009，75，： | 1 |
| 14 | Leaf gas exchange,chloroplastic pigments and dry matter accumulation in castor bean (Ricinus communis L) seedlings subjected to salt stress conditions显示文摘 | PINHEIRO H A SILVA J V ENDRES L | | 0，，03： | 1 |
| 15 | Formation processes of methane-derived authigenic carbonates from the Gulf of Cadiz显示文摘 | Magalh~es V H Pinheiro L M Ivanov M K | 2012 | Sedimentary Geology2012，24，3244： | 1 |
| 16 | PKB and megalin determine the survival or death of renal proximal tubule cells 显示文摘 | Caruso-Neves C Pinheiro AA Cai H | 2006 | Proc Nail Aead Sci U S A2006，103，18： | 1 |
| 17 | Self-sustained oscillation resonant converters operating above the resonant frequency显示文摘 | Pinheiro H Jain P Joos G | 1999 | IEEE Transactions on Power Electronics1999，14，5： | 1 |
| 18 | Leaf gas exchange,chloroplastic pigments and dry matter accumulation in castor bean(Ricinus communis L)seedlings subjected to salt stress conditions显示文摘 | Pinheiro H A Silva J V Endres L | 2008 | Industrial crops and products2008，27，3： | 1 |
| 19 | Robust controller for DFIGs of grid-connected wind turbines 显示文摘 | da Costa J P Pinheiro H Degner T | 2011 | IEEE Transactions on Industrial Electronics2011，58，9： | 1 |
| 20 | De- sign of bio - nanosystems for oral delivery of functional compounds显示文摘 | Cerqueira M A Pinheiro A C Silva H D | 2014 | Food Engineering Reviews2014，6，12： | 1 |
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