Rare-earth and trace elements of the lower Cambrian–Lower Cretaceous siliciclastic succession of NE Gondwana in Jordan : from provenance to metasomatism

• Autorzy: Amireh Belal S. , Saffarini Ghazi A. , Amaireh Mazen N. , Jarrar Chaleb H. , Abed Abdulkader A.

Identyfikatory

DOI

10.14241/asgp.2022.05

• Języki publikacji: EN

Abstrakty

EN

The present bulk-rock geochemical study aims to answer some questions concerning the distribution and variability of trace elements (TEs) and rare earth elements (REEs) in the lower Cambrian–Lower Cretaceous sandstones and mudstones of NE Gondwana in Jordan. The study proved that the REE and the TE distribution patterns in both detrital and authigenic, light and heavy minerals are controlled principally by the source-rock provenance, followed by an interplay of many factors: chemical weathering, recycling, hydraulic sorting, locally low-temperature, hydrothermal metasomatism, depositional environment and redox conditions, and diagenesis. On the basis of specific trace elements, trace-element ratios, and petrographic proxies, the provenance is constrained to be mainly felsic-, rarely mafic granitoids of the Arabian-Nubian Shield, and less commonly, recycled Palaeozoic and Mesozoic siliciclastic strata. REEs are hosted mainly in zircon, Ti-bearing minerals, and partly in clay minerals. They were depleted by both chemical weathering and recycling; nevertheless, they were enriched by subsequent hydraulic sorting and low-temperature, hydrothermal metasomatism. Chemical weathering initially depleted zirconium. However, this was counteracted by subsequent enrichment through recycling, hydraulic sorting, and low-temperature, hydrothermal metasomatism. The fractionation of the other TEs, due to these sedimentological factors during the genesis of subarkosic arenites, quartz arenites and mudstones, is discussed and some conclusions are derived. The Eu negative anomaly was enhanced significantly by recycling and low-temperature, hydrothermal metasomatism. Scandium abundance increased with decreasing grain size from coarse sand to the mud fraction. The recorded REE and TE fractionation might also apply to siliciclastics in similar, geological environments.

Słowa kluczowe

EN

Jordan; NE Gondwana; rare earth; trace elements; fractionation; provenance proxies; Arabian-Nubian Shield; siliciclastics

• Wydawca: Polskie Towarzystwo Geologiczne
• Czasopismo: Annales Societatis Geologorum Poloniae
• Rocznik: 2022
• Tom: Vol. 92, No. 2
• Strony: 109--158
• Opis fizyczny: Bibliogr. 97 poz., fot., tab., wykr.

Twórcy

autor

Amireh Belal S.

• Department of Geology, University of Jordan, Amman, 11942 Jordan

autor

Saffarini Ghazi A.

• Department of Geology, University of Jordan, Amman, 11942 Jordan

autor

Amaireh Mazen N.

• Department of Mining Engineering, Tafila Technical University, Tafila, Jordan

autor

Jarrar Chaleb H.

• Department of Geology, University of Jordan, Amman, 11942 Jordan

autor

Abed Abdulkader A.

• Department of Geology, University of Jordan, Amman, 11942 Jordan

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