Depositional environment of the Kasama Group, northeastern Zambia: Evidence from detrital zircon U-Pb-Hf isotopic compositions

REN Junping; WANG Jie; SUN Hongwei; FENG Lin; ZUO Libo; GU Alei; HE Fuqing; CHIPILAUKA Mukofu; ALPHET PHASKANI Dokowe; EZEKIAH Chikambwe; CHIWSHIMBA Canisius; DANIEL Malunga

doi:10.12029/gc20190309

GEOLOGY IN CHINA > 2019 > 46(3): 575-586. > DOI: 10.12029/gc20190309

REN Junping, WANG Jie, SUN Hongwei, FENG Lin, ZUO Libo, GU Alei, HE Fuqing, CHIPILAUKA Mukofu, ALPHET PHASKANI Dokowe, EZEKIAH Chikambwe, CHIWSHIMBA Canisius, DANIEL Malunga. Depositional environment of the Kasama Group, northeastern Zambia: Evidence from detrital zircon U-Pb-Hf isotopic compositions[J]. GEOLOGY IN CHINA, 2019, 46(3): 575-586. DOI: 10.12029/gc20190309

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Depositional environment of the Kasama Group, northeastern Zambia: Evidence from detrital zircon U-Pb-Hf isotopic compositions

1.
Tianjin Geological Survey Center of China Geological Survey, Tianjin 300170, China
2.
Geological Archives of Guizhou Province, Guiyang 550002, Guizhou, China
3.
Geological Survey Departmentof Zambia, Lusaka, P. O. Box 50135, Zambia

Funds: Supported by Chinese Geological Survey (No. 1212011220910 and No. 121201006000150014) and Sino-Zambian Co- operation in Geological and Geochemical Survey on the Scale of 1:100 000 in Kasama, Northern Province of Zambia and China-Aid Airborne Geophysical Survey and Geochemical and Geological Mapping Technical Cooperation Project in the northeast of Zambia

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Author Bio:
REN Junping, male, born in 1980, senior engineer, majors in geological survey and research; E- mail:rjp2333@126.com
Corresponding author:
WANG Jie, male, born in 1964, professor, mainly engages in geological survey and research; Email:wangjie513046@163.com
Received Date: March 21, 2018
Revised Date: June 08, 2018
Available Online: September 25, 2023

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Abstract

Abstract

The Bangweulu Block of northeastern Zambia which consists mainly of basement and sedimentary rocks is affected by northeastern Paleoproterozoic Ubendian Belt, northwestern Mesoproterozoic Kibaran Belt, southeastern Mesoproterozoic Irumide Belt and southwestern Pan African Lufulian Belt. The basement rocks are mainly composed of schist, andesitic-rhyolitic metamorphic volcanic rocks, granitoids and other intrusions. From lower to upper part the sedimentary rocks are mainly composed of the Mporokoso Group, the Kasama Group, the Katanga supergroup and Cenozoic fluvial and lacustrine sediments. The authors systematically studied the geological characteristics of the Kasama Group, U-Pb-Hf isotopic compositions and geochemical characteristics of detrital zircon from the Kasama Group in Kasama area and obtained 32 detrital zircons U-Pb ages of the purplish red siltstone from the Kasama Group. Specifically, their ages mainly vary from (1849±23) to (1993±21) Ma, suggesting that the Kasama Group was formed younger than (1434±14) Ma and should belong to Mesoproterozoic. (¹⁷⁶Hf/¹⁷⁷Hf)_i values of 22 zircons are 0.281049-0.281618 and ε_Hf(t) values are-12.8--1.6 with corresponding TDM2 ages of 2406-3487 Ma. The REE and trace elements of sandstones from Kasama Group were analyzed. The REE have obviously negative δEu anomalies and the points mainly fall in the sedimentary area; the trace elements characteristics of sandstones show that sandstones formed in the passive continental margin.
- Kasama Group,
- detrital zircon U-Pb-Hf isotopic compositions,
- REE and trace elements,
- Bangweulu Block,
- northeastern Zambia

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Depositional environment of the Kasama Group, northeastern Zambia: Evidence from detrital zircon U-Pb-Hf isotopic compositions