Stratigraphic Framework and Timing Constraints of Early Triassic Nanzhang-Yuan'an Fauna
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摘要:
海生爬行动物在早三叠世生物复苏过程中遍布在古特提斯洋和西泛大洋，南漳‒远安动物群是早三叠世最早的海生爬行动物群落之一.然而，该动物群的具体生存时代以及所赋存的嘉陵江组地层的沉积时代都还不够明确.在湖北南漳‒远安一带针对南漳‒远安动物群赋存地层开展岩石地层和同位素年代学研究.南漳‒远安动物群产于嘉陵江组二段上部的纹层状灰岩中，并获得SHRIMP Ⅱ U-Pb年龄247.8±1.2 Ma.建立了南漳‒远安地区嘉陵江组上部地层对比格架，证明南漳‒远安动物群生存在早三叠世Spathian晚期.
Abstract:The main marine reptiles spread over the eastern Paleotethys and western Panthalassa Ocean during the biotic recovery in the Early Triassic. The Nanzhang-Yuan'an fauna is one of the earliest marine reptiles in the Early Triassic. However, the specific survival time of this fauna and the fossil-bearing Jialingjiang Formation is still not well defined. Here, it conducted litho-stratigraphy and isotopic dating on the Nanzhang-Yuan'an fauna in the Nanzhang-Yuan'an area of Hubei Province. The fauna is documented in the laminated limestone of the upper Jialingjiang Formation, with a SHRIMP Ⅱ U-Pb age of 247.8±1.2 Ma. The stratigraphic framework for the upper part of the Jialingjiang Formation was established, proving that the Nanzhang-Yuan'an fauna lived in the late Spathian stage of the Early Triassic.
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Key words:
- Early Triassic /
- Nanzhang-Yuan'an fauna /
- marine reptile /
- SHRIMP Ⅱ /
- stratigraphic correlation /
- geobiology
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图 1 南漳‒远安动物群古地理位置、地质简图和和剖面位置
a.华南早三叠世奥伦尼克期古地理图，改自Feng et al.（2015）；b.南漳‒远安地区地质简图和研究剖面位置
Fig. 1. The paleogeography, simplified geological map and study locations of the Nanzhang-Yuan'an fauna
图 2 鄂西南漳‒远安地区嘉陵江组二段上部至三段下部地层对比图
Fig. 2. Lithostratigraphic correlation of representative sections in Nanzhang-Yuan'an area
图 3 南漳‒远安地区嘉陵江组野外典型照片
a.张家湾剖面单元C中纹层状灰岩；b.西流坪剖面单元C中包卷层理；c.落星村地区单元C与单元D接触关系，单元D底部为火山灰；d.西流坪剖面单元C与单元E接触关系；e.大石板剖面单元A与单元E接触关系；f.巡检剖面单元E中岩溶角砾岩
Fig. 3. Field photos of the Jialingjiang Formation in Nanzhang-Yuan'an area
图 4 南漳‒远安地区嘉陵江组第三段底部火山灰区域对比
Fig. 4. Volcanic ash beds at lowermost Member Ⅲ of the Jialingjiang Formation in Nanzhang-Yuan'an area
图 5 张家湾剖面火山灰及锆石颗粒阴极发光图像
a.张家湾剖面火山灰层；b.锆石阴极发光图像
Fig. 5. The tuff and СL images of zircons in the Zhangjiawan Section
表 1 张家湾剖面火山灰锆石SHRIMP U-Pb年龄测定结果
Table 1. SHRIMP U-Pb isotopic data for zircons from volcanic ash at the Zhangjiawan Section
Spot no. 206Pbc(%) U (10‒6) Th (10‒6) 232Th/238U 206Pb*(10‒6) 206Pb*/238U（%） σ 207Pb*/235U（%） σ 207Pb*/206Pb*（%） σ 206Pb/238U(Ma) Error corr. 1.1 2.41 278 74 0.28 9.40 0.038 93 1.10 0.280 0 3.9 0.052 2 3.8 246.2±2.9 0.279 2.1 0.70 470 121 0.27 16.1 0.039 57 0.70 0.282 7 2.3 0.051 8 2.2 250.2±1.9 0.301 3.1 1.21 318 80 0.26 10.8 0.038 98 0.84 0.271 6 3.2 0.050 5 3.1 246.5±2.2 0.265 4.1 1.93 313 79 0.26 10.7 0.039 44 1.30 0.285 0 3.9 0.052 4 3.7 249.4±3.3 0.325 5.1 0.84 544 178 0.34 18.6 0.039 70 0.65 0.281 8 2.1 0.051 5 2.0 251.0±1.7 0.309 6.1 3.05 471 149 0.33 16.1 0.039 24 0.68 0.296 7 2.3 0.054 8 2.2 248.1±1.8 0.296 7.1 1.06 303 93 0.32 10.2 0.038 78 0.85 0.280 8 2.9 0.052 5 2.8 245.2±2.2 0.291 8.1 1.32 419 114 0.28 14.3 0.039 45 0.73 0.273 3 2.4 0.050 2 2.3 249.4±1.9 0.299 9.1 1.95 301 76 0.26 10.4 0.039 77 0.86 0.292 3 2.9 0.053 3 2.8 251.4±2.3 0.294 10.1 1.44 421 89 0.22 14.6 0.040 21 0.72 0.274 5 2.7 0.049 5 2.6 254.2±1.9 0.271 11.1 0.91 549 174 0.33 18.9 0.039 76 0.87 0.259 6 2.2 0.047 4 2.0 251.3±2.3 0.394 12.1 1.37 478 122 0.26 16.1 0.038 97 0.66 0.275 0 2.9 0.051 2 2.8 246.5±1.7 0.232 注：误差为1σ，Pbc和Pb*分别为普通Pb和放射成因Pb，用204Pb测量值来矫正普通Pb. 
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