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Article Navigation >  Acta Sedimentologica Sinica  > 2017  >  35(3): 489-498

XIAO Liang, QI YaLing, MA WenZhong, LI XiangChuan, GUO JunFeng, SUN Nan, YAO XiaoYong. Stable Carbon Isotope of Middle Jurassic Plant Fossils in the North Edge of Turpan-Hami Basin, Xinjiang and Their Palaeoenvironmental Implications[J]. Acta Sedimentologica Sinica, 2017, 35(3): 489-498. doi: 10.14027/j.cnki.cjxb.2017.03.007
Citation: XIAO Liang, QI YaLing, MA WenZhong, LI XiangChuan, GUO JunFeng, SUN Nan, YAO XiaoYong. Stable Carbon Isotope of Middle Jurassic Plant Fossils in the North Edge of Turpan-Hami Basin, Xinjiang and Their Palaeoenvironmental Implications[J]. Acta Sedimentologica Sinica, 2017, 35(3): 489-498. doi: 10.14027/j.cnki.cjxb.2017.03.007
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Stable Carbon Isotope of Middle Jurassic Plant Fossils in the North Edge of Turpan-Hami Basin, Xinjiang and Their Palaeoenvironmental Implications

doi: 10.14027/j.cnki.cjxb.2017.03.007
  • 1.

    School of Earth Science and Resources, and Key Laboratory of Western Mineral Resources and Geological Engineering Ministry of Education, Chang'an University, Xi'an 710054, China;

  • 2.

    Research Institute of Petroleum Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;

  • 3.

    State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China

Funds:  National Natural Science Foundation of China, No. 41202009, 41672156, 41202008,41472015; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS), No. 153108, 123112; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University, No. 310827172005,2013G3274021, 2014G3272013
  • Received Date: 2016-11-15
  • Rev Recd Date: 2016-12-30
  • Publish Date: 2017-06-10
  • The plant fossil assemblage from the Jurassic Xishanyao Formation in the north edge of Turpan-Hami Basin, China, is ascribed into Coniopteris-Phoenicopsis flora. The four dominant genera of fossil plants which are Ginkgoites, Phoenicopsis, Cladophlebis, Stenorachis, are chosen to perform stable carbon isotopic analysis. The δ13C values of three fossil leaves of Ginkgoites, Phoenicopsis, Cladophlebis range from -21.66‰ to -23.83‰, which indicates they blong to C3 type. The Stenorachis is one fossil of reproductive organs. Its δ13C value is -20.91‰, more enriched than those of fossil leaves, showing the reliability of carbon isotopic data. According to formula, the δ13C of plants is converted into stable carbon isotopic values of atmospheric CO2 (δ13Ca). It is found that modern and Middle Jurassic δ13Ca values obtained from Ginkgoales leaves are similar to those obtained from other methods, suggesting Ginkgoales leaves are reliable specimens for reconstructing δ13Ca during geological period, which provides a simple and feasible method to obtain δ13Ca from the Mesozoic to Cenozoic. Ci/Ca is an important plant ecophysiological parameter. Thus, δ13C of Ginkgoales leaves is also converted into Ci/Ca. The Ci/Ca value of fossil Ginkgoites is 0.6, similar to 0.63 that is Ci/Ca value of living Ginkgo. It was known that palaeo-CO2 level in the Middle Jurassic is about 4.5 times of nowaday CO2. However, Ci/Ca keeps approximate constant between living and fossil Ginkgoales leaves. It indicates that Ginkgoales plants possess high photosynthetic rate in the Middle Jurassic, as well as favorable sensitivity of stomata to CO2 change. Thereby, stomata of Ginkgoales plants are good indicator of reconstructing palaeo-CO2 level. As a result, variation in Ci/Ca provides effective means to estimate whether one plant can be used as indicator to reconstruct palaeo-CO2 level.
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Publishing history
  • Received:  2016-11-15
  • Revised:  2016-12-30
  • Published:  2017-06-10

Stable Carbon Isotope of Middle Jurassic Plant Fossils in the North Edge of Turpan-Hami Basin, Xinjiang and Their Palaeoenvironmental Implications

doi: 10.14027/j.cnki.cjxb.2017.03.007
  • 1. School of Earth Science and Resources, and Key Laboratory of Western Mineral Resources and Geological Engineering Ministry of Education, Chang'an University, Xi'an 710054, China;
  • 2. Research Institute of Petroleum Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
  • 3. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
Funds:  National Natural Science Foundation of China, No. 41202009, 41672156, 41202008,41472015; State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS), No. 153108, 123112; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University, No. 310827172005,2013G3274021, 2014G3272013
  • Received Date: 2016-11-15
  • Rev Recd Date: 2016-12-30
  • Publish Date: 2017-06-10

Abstract: The plant fossil assemblage from the Jurassic Xishanyao Formation in the north edge of Turpan-Hami Basin, China, is ascribed into Coniopteris-Phoenicopsis flora. The four dominant genera of fossil plants which are Ginkgoites, Phoenicopsis, Cladophlebis, Stenorachis, are chosen to perform stable carbon isotopic analysis. The δ13C values of three fossil leaves of Ginkgoites, Phoenicopsis, Cladophlebis range from -21.66‰ to -23.83‰, which indicates they blong to C3 type. The Stenorachis is one fossil of reproductive organs. Its δ13C value is -20.91‰, more enriched than those of fossil leaves, showing the reliability of carbon isotopic data. According to formula, the δ13C of plants is converted into stable carbon isotopic values of atmospheric CO2 (δ13Ca). It is found that modern and Middle Jurassic δ13Ca values obtained from Ginkgoales leaves are similar to those obtained from other methods, suggesting Ginkgoales leaves are reliable specimens for reconstructing δ13Ca during geological period, which provides a simple and feasible method to obtain δ13Ca from the Mesozoic to Cenozoic. Ci/Ca is an important plant ecophysiological parameter. Thus, δ13C of Ginkgoales leaves is also converted into Ci/Ca. The Ci/Ca value of fossil Ginkgoites is 0.6, similar to 0.63 that is Ci/Ca value of living Ginkgo. It was known that palaeo-CO2 level in the Middle Jurassic is about 4.5 times of nowaday CO2. However, Ci/Ca keeps approximate constant between living and fossil Ginkgoales leaves. It indicates that Ginkgoales plants possess high photosynthetic rate in the Middle Jurassic, as well as favorable sensitivity of stomata to CO2 change. Thereby, stomata of Ginkgoales plants are good indicator of reconstructing palaeo-CO2 level. As a result, variation in Ci/Ca provides effective means to estimate whether one plant can be used as indicator to reconstruct palaeo-CO2 level.

XIAO Liang, QI YaLing, MA WenZhong, LI XiangChuan, GUO JunFeng, SUN Nan, YAO XiaoYong. Stable Carbon Isotope of Middle Jurassic Plant Fossils in the North Edge of Turpan-Hami Basin, Xinjiang and Their Palaeoenvironmental Implications[J]. Acta Sedimentologica Sinica, 2017, 35(3): 489-498. doi: 10.14027/j.cnki.cjxb.2017.03.007
Citation: XIAO Liang, QI YaLing, MA WenZhong, LI XiangChuan, GUO JunFeng, SUN Nan, YAO XiaoYong. Stable Carbon Isotope of Middle Jurassic Plant Fossils in the North Edge of Turpan-Hami Basin, Xinjiang and Their Palaeoenvironmental Implications[J]. Acta Sedimentologica Sinica, 2017, 35(3): 489-498. doi: 10.14027/j.cnki.cjxb.2017.03.007
shu

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