| 钱海,李根,郭刚,孔伟思,聂镜奇.黑龙江伊春市五三零、寒月林场同位素测年及其侵入岩年代厘定[J].矿产勘查,2018,9(8):1490-1495 |
| 黑龙江伊春市五三零、寒月林场同位素测年及其侵入岩年代厘定 |
| Isotopic dating and redeter mining the age of intrusive rock stratum of The 503 and Cold month forest farms of Yichun city of Heilongjiang Province |
| 投稿时间：2018-03-15 |
| DOI： |
| 中文关键词: 同位素 地层 花岗岩 侵入岩 黑龙江 |
| 英文关键词: isotope,formation,granite,intrusive rocks,Heilongjiang |
| 基金项目: |
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| 中文摘要: |
| 测区位于小兴安岭南段,总面积700 km2,属寒温带大陆季风性气候,水系较发育,平均海拔700 m,相对高差200～500 m,属中低山区,地势北高南低。区内植被发育,露头较少。在研究区内选取4件锆石样品开展了U-Pb定年、K-Ar定年,获得中细粒二长花岗岩年龄为(175±3)Ma；中细粒花岗闪长岩年龄为(180±2)Ma；细中粒含角闪石和似斑状二长花岗岩(195±2)Ma；二长花岗岩年龄为(401±2)Ma；流纹岩(J3mr)年龄为(159.3±2.3)Ma；流纹岩(P3w)年龄为(172.4±2.7)Ma。推翻了前人将区内花岗岩划为燕山早期及华力西晚期两期侵入岩,据其形成时代重新划分为3个期次:晚奥陶世、晚三叠至早侏罗世和早白垩世。进一步约束了研究区成岩成矿地质背景,同时为其构造演化的研究提供了新的线索。 |
| 英文摘要: |
| The surveyed area is located in the southern section of Xiaoxinganling, a total area of 700 square kilometers, is a cool continental monsoon climate, water system relatively well developed, an average elevation of 700 m, the relative height difference of 200 ~ 500 m. It belongs to the low mountains, high terrain in the north and low in the south. Vegetation in the area is well developed with few outcrops. Research work in the area includes selection of 4 pieces of zircon samples for U - Pb and K - Ar dates, obtains the age of the fine grained monzonitic granite(175 ± 3) Ma, the fine grained granodiorite(180 ± 2) Ma, the fine grain hornblende-containing and porphyritic-like adamellite(195 ± 2) Ma, the Monzonitic granite(401 ± 2) Ma,; the Rhyolite (J3mr)(159.3 ± 2.3) Ma, the Rhyolite (P3w)(172.4 ± 2.7) Ma. These results overthrew the predecessors conclusion of granite in the area as early Yanshan and late Variscan intrusive rocks. Three periods of formation can be defined based on the dating results:late Ordovician, late Triassic to early Jurassic, and Cretaceous. The conclusion helps further defining geological background for diagenetic mineralization in the research area, and provides a new clue to the study of its tectonic evolution. |
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