Constraints of fission track dating after the Pan-African tectonic evolution of the Bangweulu Block, northeastern Zambia

被引：0

作者：

Ren J. ^{[1
]}

Wang J. ^{[1
]}

Gu A. ^{[1
]}

Sun H. ^{[1
]}

Zuo L. ^{[1
]}

He F. ^{[1
]}

Chipilauka M. ^{[2
]}

Alphet Phaskani D. ^{[2
]}

Ezekiah C. ^{[2
]}

Evaristo K. ^{[2
]}

机构：

[1] Tianjin Center, China Geological Survey, Tianjin

[2] Geological Survey Department of Zambia, P. O. Box 50135, Lusaka

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2021年 / 95卷 / 04期

关键词：

Bangweulu Block; Fission track thermochronology; Kapatu; Northeastern Zambia; Zircon and apatite;

D O I：

10.19762/j.cnki.dizhixuebao.2021018

中图分类号：

学科分类号：

摘要：

The main tectonic evolution times of the Bangweulu Block since the Pan-African tectonic activities were studied in this paper using the zircon and apatite fission track methods. The Kapatu is located in the center part of the Bangweulu Block, northeastern Zambia. In order to study the tectonic activities of the Bangweulu Block, fresh rock samples from Mbala, Nsama and Kabweluma Formations of the Mporokoso Group were collected in Kapatu. The five zircon fission track ages are between 575±35 Ma and 380±22 Ma and the ages may be divided into two groups, i.e.600~572 Ma and 420~390 Ma. The two apatite fission track ages are between 59±6 Ma and 27±4 Ma and the ages can be divided into two groups, i.e.99~80 Ma and 19~11 Ma. All four ages groups which respectively correspond to the main periods of the Neoproterozoic Ediacaran, Lower Devonian, Late Cretaceous and Miocene. Compared with the ages from southern Africa, the tectonic activities of Neoproterozoic Ediacaran, Lower Devonian, Late Cretaceous involve a wide area and the tectonic activity during the Miocene(19~11 Ma) is not yet clear. Since the Pan-African tectonic evolution, the Bangweulu Block at least has been affected in 600~572 Ma, 488~441 Ma, 420~390 Ma, 375~293 Ma, 99~80 Ma and 19~11 Ma. Since limited data after the Pan-African tectonic evolution of the Bangweulu Block are available, these results provide important information for future work. © 2021, Science Press. All right reserved.

引用

页码：1072 / 1081

页数：9

共 37 条

[1] Andrews-Speed C P., Gold-bearing fluvial and associated tidalmarine sediments of Proterozoic age in the Mporokoso Basin, northern Zambia, Sedimentary Geology, 48, pp. 193-222, (1986)
[2] Andrews-Speed C P., The mid-Proterozoic Mporokoso basin, northern Zambia: Sequence stratigraphy, tectonic setting and potential for gold and uranium mineralisation, Precambrian Research, 44, pp. 1-17, (1989)
[3] Brown R, Summerfield M, Gleadow A, Gallagher K., Intracontinental deformation in southern Africa during the Late Cretaceous, Journal of African Earth Sciences, 100, pp. 20-41, (2014)
[4] Castaing C., Post-Pan-African tectonic evolution of south Malawi in relation to the Karroo and recent east African rift systems, Tectonophysics, 191, pp. 55-73, (1991)
[5] De Waele B, Liegeois J-P, Nemchin A A, Tembo F., Isotopic and geochemical evidence of Proterozoic episodic crustal reworking within the Irumide belt of south-central Africa, the southern metacratonic boundary of an Archaean Bangweulu Craton, Precambrian Research, 148, pp. 225-256, (2006)
[6] Donelick R A, Miller D S., Enhanced tint fission track densities in low spontaneous track density apatites using 252Cf-derived fission fragment tracks: A model and experimental observations, Nuclear Tracks and Radiation Measurements, 18, 3, pp. 301-307, (1991)
[7] Eby G N, Roden-Tice M, Krueger H L, Ewing W, Faxon E H, Woolley A R., Geochronology and cooling history of the northern part of the Chilwa Alkaline Province, Malawi, Journal of African Earth Sciences, 20, 3-4, pp. 275-288, (1995)
[8] Fernandes P, Cogne N, Chew D M, Rodrigues B, Jorge R C G S, Marques J, Jamal D, Vasconcelos L., The thermal history of the Karoo Moatize-Minjova Basin, Tete Province, Mozambique: An integrated vitrinite reflectance and apatite fission track thermochronology study, Journal of African Earth Sciences, 112, pp. 55-72, (2015)
[9] Galbraith R F., On statistical models of fission track counts, Mathematical Geosciences, 13, 6, pp. 471-478, (1981)
[10] Gernon T M, Fontana G, Field M, Sparks S J, Brown R J, Mac Niocaill C., Pyroclastic flow deposits from a Kimberlite Eruption: The Orapa South Crater, Botswana, Lithos, 112, pp. 566-578, (2009)

← 1 2 3 4 →