NDLI: Compilation of radiogenic isotope data in Mexico and their petrogenetic implications

Content Provider	Springer Nature Link
Author	Torres Alvarado, Ignacio S. Verma, Surendra P. Carrasco Núñez, Gerardo
Copyright Year	2000
Abstract	Seven hundred and twenty-five Sr, two hundred and forty-three Nd and one hundred and fifty-one Pb isotopic ratios from seven different Mexican magmatic provinces were compiled in an extensive geochemical database. Data were arranged according to the Mexican geological provinces, indicating for each province total number of analyses, range and mean of values and two times standard deviation (2σ). Data from seven provinces were included in the database: Mexican Volcanic Belt (MVB), Sierra Madre Occidental (SMO), Baja California (BC), Pacific Ocean (PacOc), Altiplano (AP), Sierra Madre del Sur (SMS), and Sierra Madre Oriental (SMOr). Isotopic values from upper mantle and lower crustal xenoliths, basement outcrops and sediments from the Cocos Plate were also compiled. In the MVB the isotopic ratios range as follows:$^{87}$Sr/$^{86}$Sr 0.703003-0.70841;$^{143}$Nd/$^{144}$Nd 0.512496-0.513098;$^{206}$Pb/$^{204}$Pb 18.567-19.580;$^{207}$Pb/$^{204}$Pb 15.466-15.647;$^{208}$Pb/$^{204}$Pb 38.065-38.632. The SMO shows a large variation in$^{87}$Sr/$^{86}$Sr ranging from ∼0.7033 to 0.71387.$^{143}$Nd/$^{144}$Nd ratios are relatively less variable with values from 0.51191 to 0.51286. Pb isotope ratios in the SMO are as follows:$^{206}$Pb/$^{204}$Pb 18.060-18.860;$^{207}$Pb/$^{204}$Pb 15.558-15.636;$^{208}$Pb/$^{204}$Pb 37.945-38.625. PacOc rocks show the most depleted Sr and Nd isotopic ratios (0.70232-0.70567 for Sr and 0.512631-0.513261 for Nd). Pb isotopes for PacOc show the following range:$^{206}$Pb/$^{204}$Pb 18.049-19.910;$^{207}$Pb/$^{2047}$Pb 15.425-15.734;$^{208}$Pb/$^{204}$Pb 37.449-39.404. The isotopic ratios of the AP rocks seem to be within the range of those from the PacOc.Most samples with reported Sr and Nd isotopic data are spread within and around the “mantle array”. The SMO seems to have been formed by a mixing process between mantle derived magmas and continental crust. The MVB appears to have a larger mantle component, with AFC as the dominant petrogenetic process for the evolved rocks. There is still a need for Pb isotopic data in all Mexican magmatic provinces and of Nd isotopes in BC, AP, SMS, and SMOr.
Starting Page	67
Ending Page	78
Page Count	12
File Format	PDF
ISSN	02534126
Journal	Journal of Earth System Science
Volume Number	109
Issue Number	1
e-ISSN	0973774X
Language	English
Publisher	Springer India
Publisher Date	2000-01-01
Publisher Institution	Indian Academy of Sciences
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radiogenic isotopes Sr, Nd, Pb magmatic provinces Mexico Pacific Ocean Cocos Plate Geosciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	1900/1901

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