胜利油田惠民凹陷辉绿岩过渡元素地球化学

GEOCHEMISTRY OF THE TRANSITION ELEMENTS IN DIABASE FROM THE HUIMIN DEPRESSION IN THE SHENGLI OILFIELD,SHANDONG PROVINCE,CHINA

测定了胜利油田惠民凹陷14件辉绿岩的过渡元素（Sc、Ti、Cr、Mn、Fe、Ni、Cu和Zn）含量。结果显示岩石中Cr和Ni含量具有很宽的范围（分别为76．9×10^-6～1049×10^-6和56．7×10^-6～495×10^-6），样品商745．2出现异常高的Cr和Ni含量，分别为8718×10^-6和4530×10^-6；Cu和Zn含量高且变化范围大，半数以上样品的Cu和Zn含量分别大于1000×10^-6（1082×10^-6～8111×10^-6）和500×10^-6（634×10^-6～2198×10^-6）。分析认为，本区辉绿岩Cr和Ni含量变化范围宽与岩浆结晶分异作用有关，具异常高Cr和Ni含量样品可能为岩浆演化相对后期，有大量铬铁矿结晶的产物；岩石富集Cu和Zn可能与岩浆上升过程中遭受地壳物质混染作用有关。

This paper determined the transition element （So, Ti, Cr, Mn, Fe, Ni, Cu and Zn） contents of 14 diahase samples from the Huimin depression in the Shengli oilfield, Shandong Province, China. The results showed that the contents of Cr and Ni vary over a wide range from 76.9× 10^-6to 1049× 10^-6and 56.7 × 10^-6 to 495 × 10^-6, respectively（with the exception of sample Shang-745-2）, sample Shang-745-2 displays abnormally high Cr and Ni contents （8718 × 10^-6and 4530 × 10^-6, respectively）, The Cu and Zn contents of the rock also vary over a wide range, obviously higher than the Clarke values and those of basalts in eastern China, and over half of the samples have the contents of Cu and Zn of more than 1000× 10^-6（1082 × 10^-6to 8111× 10^-6） and 500 × 10^-6（634 × 10^-6 to 2198 × 10^-6）, respectively. It is suggested that the Cr and Ni contents of diabase in this area vary over a wide range, which may be related to magma crystallization crystallization, and the abnormally high Cr and Ni contents may be due to chromite crystallization in the process of magmatic evolution. Copper-and Zn-enrichments may be connected with contamination by crustal materials during magma upwelling.