The discovery of XinBarag Right Banner ductile shear zone in northern Da Hinggan Mountains and its geological implications
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摘要:
大兴安岭北段新发现一条韧性剪切带——新巴尔虎右旗韧性剪切带。根据野外露头观测，该韧性剪切带为左行-逆断层性质。韧性剪切带内变形的最年轻地质体为早三叠世花岗闪长岩，其被侏罗系覆盖，且下侏罗统柴河组未发生韧性变形。通过SHRIMP锆石U-Pb测年，得出早三叠世花岗闪长岩的年龄加权平均值为249.3±4.1 Ma，结合野外地质关系，将新巴尔虎右旗韧性剪切带变形时代归属于中-晚三叠世。根据区域构造演化分析，认为其形成于蒙古-鄂霍茨克洋三叠纪晚期向额尔古纳地块南向俯冲的活动大陆边缘构造背景。通过区域韧性断裂对比，认为新巴尔虎右旗韧性剪切带为额尔古纳河-阿龙山NE向韧性变形域的南部延伸。新巴尔虎右旗韧性剪切带的发现为研究区域韧性变形构造及兴蒙造山带构造演化提供了基础资料。
Abstract:The XinBarag Right Banner ductile shear zone was firstly found in the western part of northern Da Hinggan Mountains.According to the outcrop, the ductile shear zone should be an overthrust-sinistral strike slip.The latest geological body in the ductile shear zone is Early Triassic granodiorite and its southeast part is covered by Jurassic strata including the undeformed Early Jurassic Chaihe Formation.SHRIMP zircon U-Pb dating shows that the weighted age of the Early Triassic granodiorite is 249.3±4.1 Ma.Integrated with the outcrop geological characteristics of the study area, the authors hold that this large-scale ductile shear zone was formed under an active continental margin setting of the Mongolia-Okhotsk Ocean which subducted southward to the Eergu'Na Block during the Late-Middle Triassic period.A comprehensive analysis of the regional ductile faults shows that the XinBarag Right Banner ductile shear zone is the southward extension of the NE-trending Eergu'Na River-ALongshan ductile shear zone, and this new discovery provides basic data for the study of the regional ductile deformation structure and tectonic evolution in Xing'an-Mongolian Orogenic Belt.
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表 1 早三叠世中细粒花岗闪长岩U-Th-Pb锆石测年数据分析结果
Table 1. SHRIMP zircon U-Th-Pb isotope analyses of the Early Triassicmedium fine-grained granodiorite
测点 206Pbc/% U/10-6 Th/10-6 232Th/238U 206Pb*/10-6 207Pb*/206Pb* 1σ 207Pb*/235U 1σ 206Pb*/238U 1σ errcorr 206Pb/238U年龄/Ma PM1-10-1.1 0.48 438 393 0.93 14.7 0.0478 4.5 0.256 5.7 0.0388 3.6 0.626 245.5 8.7 PM1-10-2.1 0.63 423 364 0.89 14.3 0.0456 6 0.246 7 0.0392 3.6 0.515 247.6 8.7 PM1-10-3.1 0.82 297 235 0.82 10.5 0.0447 5.4 0.251 6.5 0.0408 3.6 0.556 257.7 9.1 PM1-10-4.1 2.42 117 68 0.60 4.03 0.0421 18 0.228 19 0.0393 3.8 0.202 248.2 9.3 PM1-10-5.1 — 272 272 1.03 9.23 0.0567 4.6 0.309 5.9 0.0395 3.6 0.613 249.8 8.8 PM1-10-6.1 0.16 422 322 0.79 14.2 0.0546 5.4 0.296 6.5 0.0392 3.6 0.554 248.1 8.7 PM1-10-7.1 3.05 551 463 0.87 18.4 0.0556 7.7 0.289 8.5 0.0377 3.6 0.423 238.4 8.4 PM1-10-8.1 0.02 296 275 0.96 10 0.0508 5.5 0.276 6.6 0.0394 3.6 0.548 249.1 8.8 PM1-10-9.1 4.39 184 128 0.72 6.68 0.0466 20 0.259 20 0.0404 3.8 0.187 255.4 9.5 PM1-10-10.1 1.03 217 170 0.81 7.43 0.0499 7.1 0.272 8 0.0395 3.7 0.456 249.7 8.9 PM1-10-11.1 1.78 152 107 0.73 5.26 0.0438 20 0.239 20 0.0396 3.8 0.191 250.3 9.3 PM1-10-12.1 — 327 274 0.87 11.2 0.0511 2.5 0.281 4.4 0.04 3.6 0.824 252.7 8.9 PM1-10-13.1 1.67 292 220 0.78 9.67 0.0449 9.5 0.235 10 0.038 3.7 0.359 240.1 8.6 PM1-10-14.1 1.22 320 273 0.88 11 0.0457 9.9 0.25 11 0.0396 3.6 0.343 250.4 8.9 PM1-10-15.1 — 422 415 1.02 14.6 0.0534 2 0.297 4.1 0.0404 3.6 0.873 255.2 8.9 PM1-10-16.1 1.56 150 82 0.56 5.16 0.0447 12 0.242 12 0.0393 3.7 0.304 248.7 9.0 PM1-10-17.1 0.00 207 184 0.92 7.13 0.0538 4.2 0.297 5.5 0.04 3.6 0.655 253 9.0 PM1-10-18.1 0.19 447 426 0.98 15.5 0.0503 5.1 0.279 6.3 0.0403 3.6 0.571 254.8 9.0 PM1-10-19.1 0.38 251 238 0.98 8.41 0.0525 5.4 0.281 6.5 0.0388 3.6 0.555 245.6 8.7 
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