The Paleoproterozoic black shales of the Dhalbhum Formation exposed to the north of the Dalma metavolcanic suite is comprised of siliciclastic rocks and a minor amount of carbonaceous rocks. Geochemical studies were carried out to study the provenance and depositional setting of black shales. The average values of Co, V, U, and Cr/V (1.29) and Ni/Co (2.77) ratios in the black shales of Dhalbhum Formation are higher as compared to those of the Post-Archean Australian shale (PAAS) values (Cr/V=0.73, Ni/Co=2.39). The chondrite normalized rare earth elements (REEs) patterns, indicate the enrichment in LREE (ELREE/HREE =10.73) and flat HREEs. The immobile element ratios Th/Sc (1.14), Th/Co (1.120), Cr/Th (16.161), and La/Sc (2.80) of studied samples indicate that sediments were derived from felsic rocks, which is also corroborated by La-Th-Sc ternary diagram. The sediments deposited at the active continental margin generally show REE pattern intermediate between a typical andesite and PAAS. A continental margin tectonic setting is distinguished by La-Th-Sc, Th-Co-Zr/10 and Th-Sc-Zr/10, which is further corroborated by Yb vs Th/Ta diagram where the samples plot in the field of active continental margin.

Dalma变火山岩套北出露的Dhalbhum组古元古代黑色页岩由硅质碎屑岩和少量碳质岩组成。进行了地球化学研究以研究黑色页岩的来源和沉积环境。Dhalbhum 组黑色页岩的 Co、V、U 和 Cr/V (1.29) 和 Ni/Co (2.77) 比的平均值高于后太古代澳大利亚页岩 (PAAS) 值 ( Cr/V=0.73，Ni/Co=2.39）。球粒陨石归一化稀土元素 (REE) 模式表明 LREE (ELREE/HREE =10.73) 和平坦 HREE 的富集。研究样品的固定元素比 Th/Sc (1.14)、Th/Co (1.120)、Cr/Th (16.161) 和 La/Sc (2.80) 表明沉积物来自长英质岩石，La-Th-Sc 三元图也证实了这一点。沉积在活动大陆边缘的沉积物通常显示介于典型安山岩和 PAAS 之间的 REE 模式。大陆边缘构造环境以 La-Th-Sc、Th-Co-Zr/10 和 Th-Sc-Zr/10 为特征，Yb vs Th/Ta 图进一步证实了这一点大陆边缘。