Sr isotope evolution during chemical weathering of granites—Impact of relative weathering rates of minerals
作者： Yingjun Ma , Congqiang Liu
DOI: 10.1007/BF02907202
关键词: Plagioclase 、 Fractionation 、 Parent rock 、 Dissolution 、 Isotope 、 Weathering 、 Biogeochemical cycle 、 Geology 、 Geochemistry 、 Biotite
摘要: The Sr isotopic systematics in the weathering profiles of biotite granite and porphyry southern Jiangxi Province were investigated. results showed that during chemical granites, remarked fractionation occurred between Rb Sr. During early stages released Sr/Si Sr/Ca ratios are larger than those parent rocks, leaching rate is higher Si, Ca, K, Rb, etc. Dynamic variations relative rates main Sr-contributing minerals led to fluctuation with time in87Sr/86Sr inherent crust granite. Successive biotite, plagioclase K-feldspar made87Sr/86Sr residues show such a trend as decrease first, increase, then again till they maintain stable. This work further indicates when isotopes used trace biogeochemical processes on both catchment global scales, one must seriously take account preferential release from dissolving solid phase of87Sr/86Sr caused by minerals.
springer.com
harvard.edu
cnki.com.cn参考文章(16)
Jianfang Chen, M. G. Wiesner, H. K. Wong, Lianfu Zheng, Luqiang Xu, Shilong Zheng, Vertical changes of POC flux and indicators of early degradation of organic matter in the South China Sea Science in China Series D: Earth Sciences. ,vol. 42, pp. 120- 128 ,(1999) , 10.1007/BF02878510
Jun Chen, Zhisheng An, Yongjin Wang, Junfeng Ji, Yang Chen, Huayu Lu, Distribution of Rb and Sr in the Luochuan loess-paleosol sequence of China during the last 800 ka——Implications for paleomonsoon variations Science in China Series D: Earth Sciences. ,vol. 42, pp. 225- 232 ,(1999) , 10.1007/BF02878959
H.Wayne Nesbitt, G. Markovics, R.C. price, Chemical processes affecting alkalis and alkaline earths during continental weathering Geochimica et Cosmochimica Acta. ,vol. 44, pp. 1659- 1666 ,(1980) , 10.1016/0016-7037(80)90218-5
Eric K. Miller, Joel D. Blum, Andrew J. Friedland, Determination of soil exchangeable-cation loss and weathering rates using Sr isotopes Nature. ,vol. 362, pp. 438- 441 ,(1993) , 10.1038/362438A0
Thomas D. Bullen, David P. Krabbenhoft, Carol Kendall, Kinetic and mineralogic controls on the evolution of groundwater chemistry and 87Sr/86Sr in a sandy silicate aquifer, northern Wisconsin, USA Geochimica et Cosmochimica Acta. ,vol. 60, pp. 1807- 1821 ,(1996) , 10.1016/0016-7037(96)00052-X
Joel D. Blum, Yigal Erel, RbSr isotope systematics of a granitic soil chronosequence: The importance of biotite weathering Geochimica et Cosmochimica Acta. ,vol. 61, pp. 3193- 3204 ,(1997) , 10.1016/S0016-7037(97)00148-8
Thomas Bullen, Arthur White, Alex Blum, Jennifer Harden, Marjorie Schulz, Chemical weathering of a soil chronosequence on granitoid alluvium : II. Mineralogic and isotopic constraints on the behavior of strontium Geochimica et Cosmochimica Acta. ,vol. 61, pp. 291- 306 ,(1997) , 10.1016/S0016-7037(96)00344-4
N. Clauer, Strontium and argon isotopes in naturally weathered biotites, muscovites and feldspars Chemical Geology. ,vol. 31, pp. 325- 334 ,(1980) , 10.1016/0009-2541(80)90094-7
Congqiang Liu, Jing Zhang, Chunlai Li, Variations in CaCO3 content and Sr isotopic composition of loess and records of paleoclimatic fluctuations Chinese Science Bulletin. ,vol. 44, pp. 1512- 1516 ,(1999) , 10.1007/BF03183575
S.L. Brantley, J.T. Chesley, L.L. Stillings, Isotopic ratios and release rates of strontium measured from weathering feldspars Geochimica et Cosmochimica Acta. ,vol. 62, pp. 1493- 1500 ,(1998) , 10.1016/S0016-7037(98)00082-9