延边天佛指山花岗岩年代学和地球化学研究表明，花岗岩中的锆石 U- - Pb 年龄为 (188. 5 ±2. 2) Ma，其侵位时间为早侏罗世。岩石总体上具有高硅、低铝、贫钙镁及富碱的特征，属高钾钙碱性系列 I 型花岗岩; 富集轻稀土元素 (LREE) 和大离子亲石元素 (LILE) Rb、Th、U、K 等，相对亏损高场强元素 (HFSE) Zr、Hf、Y、Yb 等，显著亏损 Ba、Nb、Ta、P、Ti 等元素，δEu 呈轻微程度负异常。该花岗岩岩浆源于地壳物质的部分熔融，可能形成于与古太平洋板块俯冲相关联的活动大陆边缘环境。

The chronological and geochemical studies of granites in Tianfozhishan of Yanbian show the zircon U - - Pb dating of granites as (188. 5 ±2. 2) Ma，in the Early Jurassic． The granites are characterized by high sili- con and alkali，low aluminium，calcium and magnesium，belonging to high- K calc- alkaline series I type granites． Rocks are riched in LREE and LILE (e. g． Rb，Th，U and K)，relatively deficited in HFSE (e. g． Zr，Hf，Y and Yb) and significantly deficited in Ba，Nb，Ta，P and Ti，with weak Eu anomaly． The granite magma derived from partial melting crustal material，and may be formed in an active continental margin associated with subduction of Paleo- Pacific Plate．