U-Pb and Pb-Pb single zircon ages for charno-enderbites from the Magondi mobile belt, northwest Zimbabwe

H. Munyanyiwa; A. Kroner; P. Jaeckel

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U-Pb and Pb-Pb single zircon ages for charno-enderbites from the Magondi mobile belt, northwest Zimbabwe

机译：来自津巴布韦西北部Magondi移动带的黑碳锆石的U-Pb和Pb-Pb单一锆石年龄

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The Magondi mobile belt in northwest Zimbabwe is dominated by a supracrustal sequence composed of metasedimentary and minor tholeiitic volcanic rocks, tuffs, and agglomerates. The grade of metamorphism increases northwards from green-schist to upper amphibolite facies with patchy development of granulites. Within the upper amphibolite and granulite facies terrains, quartzofeldspathic migmatitic orthogneisses interlayered with paragneisses are the dominant lithologies. Together they are intruded by small bodies of charno-enderbite. The charno-enderbites are interpreted as syn-metamorphic intru-sives, originally of granodioritic composition. The age relationships between the supracrustal and meta-igneous rocks are not precisely known. Single zircon ~(207)Pb/~(206)Pb and conventional U-Pb ages constrain the emplacement of the charno-enderbites to 1930 - 1960 Ma. The age is also taken to reflect the time of granulite metamorphism within the Magondi mobile belt. The results further constrain the minimum age of the gneisses into which the charno-enderbites were emplaced. In addition, the emplacement ages of the charno-enderbites show that the rocks are part of an important Palaeo-proterozoic magmatic event in northwest Zimbabwe, corresponding in time to widespread magmatism in the Bangweulu Block of northern Zambia and in the Ubendian belt of southern Tanzania.

机译：津巴布韦西北部的Magondi移动带主要由超沉积火山岩，凝灰岩和团聚体组成的壳上层序。变质的程度从绿色片岩到上层的角闪石相向北增加，同时有斑粒状的发育。在上层角砾岩和花岗石相地带中，层状脉石层间夹杂的石英辉长生质直长片麻岩是主要的岩性。它们一起被小小的charno-enderbite入侵。 charno-enderbits被解释为同质变质的侵入物，最初是由花岗二色组成的。尚不清楚上地壳岩与亚火成岩之间的年龄关系。单一锆石〜（207）Pb /〜（206）Pb和常规的U-Pb年龄限制了黑碳质ender咬的位置到1930-1960 Ma。年龄也反映了Magondi移动带中的花岗石变质时间。结果进一步限制了放置斜角-咬合的片麻岩的最小年龄。此外，黑碳岩咬陷的年龄表明，这些岩石是津巴布韦西北部重要的古元古代岩浆事件的一部分，及时地对应于赞比亚北部的邦圭路区块和坦桑尼亚南部的乌本地带的广泛岩浆活动。。

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来源
《South African journal of geology》 |1995年第1期|p.52-57|共6页
作者
H. Munyanyiwa; A. Kroner; P. Jaeckel;
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University of Zimbabwe, Department of Geology, P.O. Box MP 167 Mount Pleasant, Harare, Zimbabwe;

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U-Pb and Pb-Pb single zircon ages for charno-enderbites from the Magondi mobile belt, northwest Zimbabwe

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