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| 1 | 华南陆缘粤南地区晚三叠世-早、中侏罗世古气候演化及其对华南构造体制转换的响应显示文摘华南早中生代构造体制转换对粤南地区古气候演化产生了深远影响,但对其内在联系的研究尚有不足.本文以粤南地区上三叠统‒下、中侏罗统小坪组、金鸡组、桥源组为研究对象,采集各组泥岩样品进行了X⁃射线荧光光谱主量元素和ICP⁃MS微量、稀土元素测试,并开展了沉积特征和古生物特征综合分析.测试表明,小坪组凤岗段泥岩样品CIA(75.7~81.3)、Sr/Cu(0.83~21.3)、Rb/Sr(2.32~12.8)、Mg/Ca(0.57~2.50)和Sr/Ba(0.04~0.19)均指示该区晚三叠世早期为温湿气候,δCe(0.93~0.95)指示弱氧化环境,间接反映该时期为温湿气候;小坪组马安段泥岩样品CIA(77.5~82.2)、Sr/Cu(8.41~13.3)、Rb/Sr(2.08~5.83)、Mg/Ca(0.79~3.10)和Sr/Ba(0.06~0.26)指示该区晚三叠世晚期为干热气候,δCe(1.04~1.05)指示还原环境,间接反映该时期为干热气候;金鸡组、桥源组泥岩样品CIA(77.1~82.3)、Sr/Cu(1.51~4.38)、Rb/Sr(2.16~12.1)、Mg/Ca(0.84~2.94)和Sr/Ba(0.04~0.24)指示该区早侏罗世‒早、中侏罗世以温湿气候为主,短暂出现干热气候,δCe(0.92~1.00)指示弱还原‒弱氧化环境,间接反映该时期气候以温湿为主,短暂出现干热.将研究区与周缘地区古气候进行对比,晚三叠世‒早、中侏罗世粤南及其围区古气候都经历了由温湿(晚三叠世早期)‒干热(晚三叠世晚期)‒温湿为主,短暂出现干热(早侏罗世‒早、中侏罗世)的转变,这一具有相同演化趋势的古气候转变,正是对该时期华南经历了由特提斯构造域向古太平洋构造域转换的响应. | 陈森然 许中杰 孔锦涛 程日辉 王嘹亮 | 2021 | 地球科学2021，46，9： | 3 |
| 2 | Anatomical Study of Cretaceous,Permineralized,Bennettitalean Fossils from Heilongjiang Province,NE China显示文摘Well-preserved Cretaceous trunk fragments of Cycadeoidea(Cycadeoidaceae)were recently found in Keshan County,Heilongjiang Province,Northeast China.These fossils represent important evidence of the distribution of this group of plants in East Asia.In these trunk fragments,the stem cortices and leaf bases with cones are preserved.The leaf bases are rhombic with cones infrequently distributed among leaf bases.The cortex is broad and consists of fundamental parenchyma cells,numerous secretory ducts and C-shaped leaf traces with adaxial secondary xylem and abaxial secondary phloem.The genus Cycadeoidea,which is widely distributed in the Cretaceous deposits of East Asia,North America and Western Europe,was an important component of Cretaceous floras.Bennettitalean trunk fossils with well-preserved anatomical structures are rarely known from China.These fossils are important for studies of the evolution of genus Cycadeoidea and for stratigraphic correlation. | LIU Fengxiang YANG Xiaonan CHENG Yeming | 2022 | Acta Geologica Sinica(English Edition)2022，96，5： | 0 |
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