PETROLOGY OF THE EUROPE-LARGEST BURAKOVKA EARLY PALEOPROTEROZOIC LAYERED PLUTON (SOUTHERN KARELIA, RUSSIA)
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PETROLOGY OF THE EUROPE-LARGEST BURAKOVKA EARLY PALEOPROTEROZOIC LAYERED PLUTON (SOUTHERN KARELIA, RUSSIA)
Chistyakov A.V.; Sharkov E.V.; Grokhovskaya T.L.; Bogatikov O.A.; Muravitskaya G.N.; Grinevich N.G.
xmlui.dri2xhtml.METS-1.0.item-citation:
Russian Journal of Earth Sciences, 2002, 4, 1, 35-75
Date:
2002
Abstract:
The Burakovka layered pluton of basic and mafic rocks is the largest intrusive massif in the Baltic Province composed of Si- and Mg-rich boninite-like rocks. The pluton consists of two individual bodies, each having its own internal structure, and contacting each other in their apical parts, known as the Aganozero and Shalozero-Burakovka bodies. Both bodies have a similar rock sequence including five differentiated zones (upward): mafic rocks, pyroxenite, gabbro norite, pigeonite gabbro norite, and magnetite gabbro diorite (the latter found only in the Shalozero-Burakovka Body). Being generally similar to each other, these bodies differ notably in the styles of their cumulate stratigraphy and, to a lesser extent, in composition. The pluton is distinguished by the presence of markers - singular interlayers of high-temperature mafic cumulates emplaced in the sequence of lower-T formations. Their origin is believed to have been associated with the intrusion of fresh magma portions into the crystallizing magma chambers. The same mechanism is believed to have been responsible for a macrorhythmic pattern found in the southeastern portion of the Shalozero-Burakovka intrusive body. Using chemical and mineralogical data, it is shown that the bodies discussed were derived from similar high-Si and high-Mg magmas, except that the Aganozero Body was emplaced 50 million years later than the Shalozero-Burakovka intrusion: the former was dated (Sm-Nd isochron) 2372 <img src="latex006.gif" alt="pm"> 22 Ma ( <font face="Symbol">e Nd=-3.22<img src="latex006.gif" alt="pm">0.13 ), and the latter, 2433 <img src="latex006.gif" alt="pm"> 28 Ma ( <font face="Symbol">e Nd=-3.14<img src="latex006.gif" alt="pm">0.14 ). It is concluded that the Burakovka Pluton was a long-lived magma center which developed above a local mantle plume, the origin of which had been associated with the activity of a megaplume which had been responsible for the existence of the Baltic province throughout a period of 200 million years. 28 Ma ( <font face="Symbol">e Nd=-3.14<img src="/get_item_image.asp?id=21531042&img=latex006.gif" align=absmiddle border=0>0.14 ). It is concluded that the Burakovka Pluton was a long-lived magma center which developed above a local mantle plume, the origin of which had been associated with the activity of a megaplume which had been responsible for the existence of the Baltic province throughout a period of 200 million years.
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