| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
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. 2019. Depositional environment of the Kasama Group, northeastern Zambia: Evidence from detrital zircon U-Pb-Hf isotopic compositions[J]. Geology in China, 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
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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 εHf(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.
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References
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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. 2019. Depositional environment of the Kasama Group, northeastern Zambia: Evidence from detrital zircon U-Pb-Hf isotopic compositions[J]. Geology in China, 46(3): 575-586. doi: 10.12029/gc20190309
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Figure 1.
Tectonic map (a, after Haest et al., 2011) and geological map of the Kasama region (b)
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Figure 2.
The outcrop characteristics of the purplish red siltstone from the 2nd member of the Lower Kasama Formation
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Figure 3.
The microphotographs of the purplish red siltstone from the 2nd member of the Lower Kasama Formation
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Figure 4.
Representative cathodoluminescence images of the purplish red siltstone detrital zircons from the 2nd member of the Lower Kasama Formation
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Figure 5.
U-Pb concordia diagrams of the purplish red siltstone detrital zircons from the 2nd member of the Lower Kasama Formation
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Figure 6.
U-Pb ages vs. εHf(t)value plot of the purplish red siltstone detrital zircons from the 2nd member of the Lower Kasama Formation
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Figure 7.
Chondrite-normalized REE patterns of the sandstones in Kasama Group (normalizing parameters after Boynton, 1984)
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Figure 8.
La/Yb-ΣREE diagram of the sandstones in Kasama Group (after McLennan et al., 1993)
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Figure 9.
Th−Zr, La−Th−Sc and Th−Co−Zr/10 tectonic discrimination diagrams (after Bhatia and Crook, 1986)