Reviews in garnet-biotite geothermometer: Its versions, inherent problems of accuracy and precision, and perspective for further research
Reviews in garnet-biotite geothermometer: Its versions, inherent problems of accuracy and precision, and perspective for further research
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石榴石-黑云母地温计综述：其版本、准确度和精确度的固有问题以及进一步研究的前景
DOI：
10.1007/bf02876245
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Pan Yusheng
中科院分区：
文献类型：
--
作者：
Wu Chunming;Pan Yusheng
本文简要介绍了石榴子石-黑云母铁镁交换地质温度计的21种版本，指出了地质温度计固有的系统误差来源。其来源在于：（1）假设石榴子石和黑云母中的Fe-Mg为理想混合，（2）未完全考虑石榴子石和黑云母的非理想性质，（3）几乎忽略了石榴子石中的微量元素Mn、Ca和黑云母中的微量元素AlVI、Ti、Mn，（4）压力对平衡的影响虽然很小，但几乎没有考虑，实验是在一个固定的压力下进行的;（5）用于回归分析的数据数量太少;（6）用于经验校准的数据的内部一致性没有得到充分保证;（7）作者将能量参数W's（Margule参数）与压力和温度无关，尽管前者实际上是后者的函数;（8）最重要的组成-活度关系与标定所用矿物组成不一致。此外，我们认为，经验校准无法避免以下问题：（1）退变质作用的影响;（2）不一致的数据集;（3）压力对温度估计的影响;（4）Fe 3+计算的影响。为了准确地校准地质温度计，需要进行精确的实验工作，其中Margule参数应被视为压力、温度和矿物成分的函数。
This paper briefly introduces twenty-one versions of garnet-biotite Fe−Mg exchange geothermometry, points out the sources of systematic errors inherent in geothermometry. The sources lie in that: (1) ideal Fe−Mg mixing in garnet and biotite is assumed; (2) non-ideal properties of both garnet and biotite are not considered completely; (3) minor elements—Mn, Ca in garnet, and AlVI, Ti, Mn in biotite are almost neglected; (4) effects of pressure on equilibrium, although little, are almost not taken into consideration, and experiments were conducted at one fixed pressure; (5) the data used for regression analysis is too scarce in quantity; (6) internal consistency of the data used for empirical calibration is not fully guaranteed; (7) the authors take energy parameters W's (Margule's parameters) independent of pressure and temperature, though the former are actually the functions of the latter items; and (8) the most important composition-activity relationship is not consistent with the mineral compositions used for calibration. Furthermore, it is believed that empirical calibrations cannot avoid the following problems: (1) effect of retrograde metamorphism; (2) inconsistent data set; (3) effect of pressure on temperature estimation; and (4) effect of Fe3+calculation. Exact experimental work should be done in order to accurately calibrate the geothermometer in which the Margule's parameters should be treated as the functions of pressure, temperature, and mineral compositions.