Journal ArticleDOI
Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins
Mukul R. Bhatia,Keith A.W. Crook +1 more
Reads0
Chats0
TLDR
In this article, a large variation in trace element characteristics of graywackes of the Paleozoic turbidite sequences of eastern Australia show a large increase in light rare earth elements (La, Ce, Nd), Th, Nb and the Ba/Sr, Rb, Sr, La/Y and Ni/Co ratios.Abstract:
The graywackes of Paleozoic turbidite sequences of eastern Australia show a large variation in their trace element characteristics, which reflect distinct provenance types and tectonic settings for various suites. The tectonic settings recognised are oceanic island arc, continental island arc, active continental margin, and passive margins. Immobile trace elements, e.g. La, Ce, Nd, Th, Zr, Nb, Y, Sc and Co are very useful in tectonic setting discrimination. In general, there is a systematic increase in light rare earth elements (La, Ce, Nd), Th, Nb and the Ba/Sr, Rb/Sr, La/Y and Ni/Co ratios and a decrease in V, Sc and the Ba/Rb, K/Th and K/U ratios in graywackes from oceanic island arc to continental island arc to active continental margin to passive margin settings. On the basis of graywacke geochemistry, the optimum discrimination of the tectonic settings of sedimentary basins is achieved by La-Th, La-Th-Sc, Ti/Zr-La/Sc, La/Y-Sc/Cr, Th-Sc-Zr/10 and Th-Co-Zr/10 plots. The analysed oceanic island arc graywackes are characterised by extremely low abundances of La, Th, U, Zr, Nb; low Th/U and high La/Sc, La/Th, Ti/Zr, Zr/Th ratios. The studied graywackes of the continental island arc type setting are characterised by increased abundances of La, Th, U, Zr and Nb, and can be identified by the La-Th-Sc and La/Sc versus Ti/Zr plots. Active continental margin and passive margin graywackes are discriminated by the Th-Sc-Zr/10 and Th-Co-Zr/10 plots and associated parameters (e.g. Th/Zr, Th/Sc). The most important characteristic of the analysed passive margin type graywackes is the increased abundance of Zr, high Zr/Th and lower Ba, Rb, Sr and Ti/Zr ratio compared to the active continental margin graywackes.read more
Citations
More filters
Journal ArticleDOI
Relationships between the trace element composition of sedimentary rocks and upper continental crust
TL;DR: In this paper, the upper crustal abundances of several trace elements, including rare earth elements (REEs), were compared to the upper continental crust of the United States, and the results showed that no revisions are needed for these elements.
Journal ArticleDOI
Provenance signatures of sandstone-mudstone suites determined using discriminant function analysis of major-element data
B.P. Roser,R.J. Korsch +1 more
TL;DR: In this paper, a set of functions using oxide Al 2 O 3 ratios are designed for samples influenced by biogenic sedimentation, which are applicable only to rocks which lack significant biogenic fractions, or to those where analyses can be corrected for these inputs.
Journal ArticleDOI
The influence of sediment recycling and basement composition on evolution of mudrock chemistry in the southwestern United States
TL;DR: In this paper, the authors report systematic changes in mudrock composition through time on a single con- tinental cmstal block and show that the changes reflect both sediment recycling processes and changes through time in the composition of crystalline material being added to the sedimentary system and are related to tectonic evolution as the block matures from a series of accreted arc terranes to a stable craton.
Journal ArticleDOI
Geochemical and NdSr isotopic composition of deep-sea turbidites: Crustal evolution and plate tectonic associations
TL;DR: In this article, the authors show that trace element abundances of modern turbidites, from both active and passive settings, differ from Archean turbidite in several important ways.
Journal ArticleDOI
Contrasting geochemical and Sm-Nd isotopic compositions of Archean metasediments from the Kongling high-grade terrain of the Yangtze craton: evidence for cratonic evolution and redistribution of REE during crustal anatexis
TL;DR: In this article, three clastic metasediments from the Kongling high-grade terrain of the Yangtze craton, South China were analyzed for major, trace and rare earth elements and Sm-Nd isotopic ratios.
References
More filters
Journal ArticleDOI
Geochemical discrimination of different magma series and their differentiation products using immobile elements
TL;DR: In this article, the abundance and distribution of selected minor and trace elements (Ti, Zr, Y, Nb, Ce, Ga and Sc) in fresh volcanic rocks can be used to classify the differentiation products of subalkaline and alkaline magma series in a similar manner to methods using normative or major-element indices.
Journal ArticleDOI
Tectonic setting of basic volcanic rocks determined using trace element analyses
Julian A. Pearce,J.R. Cann +1 more
TL;DR: In this paper, the results of analyses for Ti, Zr, Y, Nb and Sr in over 200 basaltic rocks from different tectonic settings have been used to construct diagrams in which these settings can usually be identified.
Journal ArticleDOI
Plate tectonics and sandstone compositions
TL;DR: The relationship between provenance and basin is important for hydrocarbon exploration because sand frameworks of contrasting detrital compositions respond differently to diagenesis, and thus display different trends of porosity reduction with depth of burial as mentioned in this paper.
Related Papers (5)
Early Proterozoic climates and plate motions inferred from major element chemistry of lutites
H.W. Nesbitt,Grant M. Young +1 more