An extensive dataset of major- and trace-element and B-isotope composition related to the compositional variation of the tourmalines from the S-type granite and pegmatite from the Upper Bonai and Gangpur Group granitoids, eastern India, is provided. The Gangpur Schist Belt, consisting of the Upper Bonai and Gangpur Group, lies at the eastern end of the Proterozoic Central Indian Tectonic Zone. An attempt to constrain the source of the boron isotope and describe the magmatic–hydrothermal evolution of the granite–pegmatite system is made. The tourmalines record generally low trace-element concentrations, with the exception of some elements such as Zn, Li, Ga, Mn and Ti. The Zn and Li concentration increases from the tourmalines in the granites to the tourmalines in the pegmatite. Trace-element compositions also vary slightly from the core tourmaline to the rim tourmaline. Tourmalines in granites/pegmatites are mostly Fe-rich schorl, and have S-type B-isotopic signature (δ11B = −10‰ to −12‰). Their chemistries reflect changing salinities of the granitic melts as well as vapour exsolution during progressive crystallization. This study indicates that the tourmalines in the pegmatites crystallized from evolved flux-element-rich (F, B, Li) melt, probably after the crystallization of granite-forming melt.

中文翻译：

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S 型花岗岩和伟晶岩中电气石的生长和演化：来自印度东部 Gangpur 片岩带花岗岩的结构、化学和 B 同位素研究的限制

提供了与印度东部上博奈和冈普尔群花岗岩的 S 型花岗岩和伟晶岩的碧玺组成变化相关的主要元素和微量元素以及 B 同位素组成的广泛数据集。冈普尔片岩带由上博奈群和冈普尔群组成，位于元古代中印度构造带的东端。试图限制硼同位素的来源并描述花岗岩-伟晶岩系统的岩浆-热液演化。除了 Zn、Li、Ga、Mn 和 Ti 等某些元素外，电气石的微量元素浓度普遍较低。从花岗岩中的电气石到伟晶岩中的电气石，锌和锂的浓度增加。从核心碧玺到边缘碧玺，微量元素成分也略有不同。花岗岩/伟晶岩中的电气石大多是富铁的 schorl，具有 S 型 B 同位素特征（δ11B = -10‰ 至 -12‰)。它们的化学成分反映了花岗岩熔体盐度的变化以及逐步结晶过程中的蒸汽溶出。这项研究表明伟晶岩中的电气石是从演化的富通量元素（F、B、Li）熔体中结晶出来的，可能是在形成花岗岩的熔体结晶之后。