祁連造山帶是中國大陸主要造山帶之一，大致分為北祁連、中祁連、南祁連和拉雞山。本研究區域位於甘肅省蘭州市東北150公里處，主要為前震旦紀的馬啣山群，及其鄰近的震旦紀地層及奧陶紀地層。馬啣山群為中南祁連地塊東段下元古代地層重要的組成部分。本研究著重於其變質變形的作用和變質溫壓環境，配合氬-氬定年的結果，以探討本區的變質史。
　　馬啣山群的石榴子石具生長環帶：從核心到邊緣，錳含量減少，鐵含量漸增，此成份變化在壓力不變的情形下指示著溫度的上升：其核心和邊緣的溫度分別為418OC及545OC。鈣質角閃石不具化學環帶。馬啣山群之變質作用：（1）峰期變質為角閃岩相，其礦物組合為黑雲母+角閃石，溫壓為618OC，6.57kbar。（2）經綠簾角閃岩相，礦物組合為綠簾石+鈉長石+鈣質角閃石。（3）後為綠片岩相，礦物組合為陽起石±脆綠泥石+方解石。震旦紀地層的岩石類型主要為綠片岩相的片岩，其礦物組合為綠泥石+鈉長石+赤鐵礦+方解石+石英；局部受韌性剪切帶影響，而產生糜嶺岩化作用。奧陶紀地層主要岩石類型為大理岩，其碳酸岩類礦物由方解石和白雲石所組成，這些大理岩中除了有磷灰石夾層外，且有高鎂分率之金雲母。
40Ar-39Ar定年結果，角閃岩與花崗岩中角閃石和黑雲母的坦原年代分別為340±0.5Ma及323.4±0.65Ma，顯示前震旦紀馬啣山群在石炭紀受區域斷層活動而使其發生再活化作用時間的下限。

　　The Qilian fold belt is one of the major orogenic belts in China. Traditionally, it is divided into north Qilian fold belt, central Qilian uplift, south Qilian fold belt and Layjyishan area. The study area is located at 150km northeast to Lanzhau city; the major part of the study area belongs to the Maxianshan Group. This research is focused on petrography, mineral chemistry and geochronology to establish the P-T paths, paragenesis and deformation sequence of the area.

　　The Pre-Sinian metamorphic rocks, the Maxianshan Group, have experienced a complex history of three stages of metamorphism. The stageⅠamphibolite facies is the peak metamorphism, mineral assemblages of which are biotite+ calcium amphibole, the condition is 618 OC, and 6.57kbar. The stageⅡis epidote amphibolite facies , mineral assemblages of which are epidote+ albite+ calcium amphibole. The stageⅢis greenschist facies, mineral assemblages of which are actinolite± corundophilite+ calcite. The compositions of calcium amphiboles are homogeneous. The temperature of core and rim of garnets are 418OC and 545OC respectively. The Sinian metamorphic rocks are greenschist facies, mineral assemblages of which are chlorite+ albite+ hematite+ calcite+ quartz. The Ordovician metamorphic rocks are marbles, which contain apatite layers and phlogopite.

　　The 40Ar-39Ar dating on hornblende and biotite separated from amphibolite and granite have the plateau ages of 340±0.5Ma and 323.4±0.65Ma respectively. This may represent the re-active ages of the Maxianshan Group.

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