Arid
DOI10.1086/629825
Assessing differences in composition between low metamorphic grade mudstones and high-grade schists using Logratio techniques
Cardenas, AA; Girty, GH; Hanson, AD; Lahren, MM; Knaack, C; Johnson, D
通讯作者Cardenas, AA
来源期刊JOURNAL OF GEOLOGY
ISSN0022-1376
EISSN1537-5269
出版年1996
卷号104期号:3页码:279-293
英文摘要

Based on stratigraphic and petrologic similarities, it has been proposed that rocks exposed in roof pendants of the central Sierra Nevada, California are part of a tectonically displaced fragment of the Cordilleran miogeocline. We have identified significant geochemical similarities between metamudstones making up this miogeoclinal fragment and rocks comprising its proposed parents in the Mojave Desert-southern Great Basin region by geochemical analysis of samples collected from Snow Lake and Boyden Cave roof pendants, and from the Precambrian to Cambrian section of the Cordilleran miogeocline exposed in the Nopah Range, southeastern California. In order to circumvent the constant-sum problem inherent in geochemical data, the data were transformed into a continuous-variable format using logratio techniques. When the differences in means of aluminum-normalized logratioed data derived from the Snow Lake-Boyden Cave data set and the Nopah Range samples were calculated on an element by element basis, similar to 86% of the differences were not statistically significant at the 95% confidence level. The large number of compositional similarities identified between Snow Lake, Boyden Cave, and Nopah Range samples are consistent with the idea that the metasedimentary rocks of the central Sierra Nevada batholith are composed of material shed from the western North American interior and that roof pendants in the central Sierra Nevada are part of a displaced miogeoclinal fragment. This work demonstrates that rigorous statistical analyses of geochemical data transformed into a continuous-variable format can be a useful tool in evaluating the plausibility of lithostratigraphic correlations between metamorphosed, complexly deformed, and displaced metasedimentary rocks.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:A1996UH71900003
WOS关键词RARE-EARTH ELEMENTS ; PALEOZOIC CONTINENTAL-CRUST ; CAMBRIAN MIOGEOCLINAL ROCKS ; PLASMA-MASS-SPECTROMETRY ; SNOW LAKE PENDANT ; SEDIMENTARY-ROCKS ; GEOLOGICAL-MATERIALS ; MOJAVE DESERT ; SIERRA-NEVADA ; EVOLUTION
WOS类目Geology
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/133084
作者单位(1)STANFORD UNIV, DEPT GEOL & ENVIRONM SCI, STANFORD, CA 94305 USA;(2)UNIV NEVADA, DEPT GEOL SCI, RENO, NV 89557 USA;(3)WASHINGTON STATE UNIV, DEPT GEOL, PULLMAN, WA 99164 USA
推荐引用方式
GB/T 7714
Cardenas, AA,Girty, GH,Hanson, AD,et al. Assessing differences in composition between low metamorphic grade mudstones and high-grade schists using Logratio techniques[J],1996,104(3):279-293.
APA Cardenas, AA,Girty, GH,Hanson, AD,Lahren, MM,Knaack, C,&Johnson, D.(1996).Assessing differences in composition between low metamorphic grade mudstones and high-grade schists using Logratio techniques.JOURNAL OF GEOLOGY,104(3),279-293.
MLA Cardenas, AA,et al."Assessing differences in composition between low metamorphic grade mudstones and high-grade schists using Logratio techniques".JOURNAL OF GEOLOGY 104.3(1996):279-293.
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