This study presents the first attempt to recognize the planktonic foraminiferal biozones and to determine the time of deposition of the carbonate deposits exposed in the Zgaimat Al-Hasah anticline, Southeastern Jordan...This study presents the first attempt to recognize the planktonic foraminiferal biozones and to determine the time of deposition of the carbonate deposits exposed in the Zgaimat Al-Hasah anticline, Southeastern Jordan. Five equivalent planktonic foraminiferal biozones;Zones E3 (P6a), E4 (P6b), E5 (P7), E6 (P8), and E7 or E7a were identified by analyzing twenty-eight samples from a 20 m thick section. Ten planktonic foraminiferal species belonging to seven genera and thirteen benthic foraminiferal species representing eleven genera were recorded. An Early Eocene age was assigned to the carbonate deposits exposed in Zgaimat Al-Hasah anticline based on some typical index species of calcareous planktonic foraminifera.展开更多
Abundant conodont elements have been recovered from the Hwajeol Formation, to allow five zones to be erected： Proconodontus, Eoconodontus notchpeakensis, Cambrooistodus minutus, Cordylodus proavus, and Fryxellodontus...Abundant conodont elements have been recovered from the Hwajeol Formation, to allow five zones to be erected： Proconodontus, Eoconodontus notchpeakensis, Cambrooistodus minutus, Cordylodus proavus, and Fryxellodontus inornatus-Monocostodus sevierensis-Semiacontiodus lavadamensis zones, in ascending order. More confident biozones are recognized in the Sesong Slate and lower Hwajeol Formation in the Makgol section, a part of the southern limb of the Baekunsan syncline, Taebaeksan Basin, Korea, especially focusing on the conodont biostratigraphic boundary of two units, and the subdivision potential of the previous ＂Proconodontus Zone＂, lowermost biozone of the Hwajeol Formation. Similarly, only a few conodont elements recovered from upper 14.5 m interval, namely the Furongian portion of the Sesong Slate, in the Makgol section did not allow erection of a biozone. Nevertheless, this part of the unit plus the basal 2.5 m interval of the Hwajeol Formation is characterized by the occurrence of Prooneotodus rotundatus（Druce and Jones）, Teridontus nakamurai（Nogami）, Phakelodus elongatus（An） and Phakelodus tenuis Müller. This interval marks the early Furongian ＂Prooneotodus rotundatus Zone＂. The rest of the measured section yielded relatively abundant conodonts, so three conodont biozones are proposed, based on the successive appearance of key species： Proconodontus tenuiserratus, Proconodontus posterocostatus, and Proconodontus muelleri zones, in ascending order, and thus allowing subdivision of the previous ＂Proconodontus Zone＂. The four conodont biozones are correlated with the relevant biozones of North and South China, and North America.展开更多
IN the past 12 years, the Multidisciplinary Oceanographic Expedition Team to Nansha Islandsorganized by the Chinese Academy of Sciences has carried out many investigations and ob-tained a lot of scientific research re...IN the past 12 years, the Multidisciplinary Oceanographic Expedition Team to Nansha Islandsorganized by the Chinese Academy of Sciences has carried out many investigations and ob-tained a lot of scientific research results. In the present study, 177 surface sediments and 7core specimens were used for analyzing foraminifers, ostracods, radiolarians, bryozoans, gas-tropods, bivalves, diatoms, dinonagellates, sporopollen and calcareous nannoplankton, con-展开更多
文摘This study presents the first attempt to recognize the planktonic foraminiferal biozones and to determine the time of deposition of the carbonate deposits exposed in the Zgaimat Al-Hasah anticline, Southeastern Jordan. Five equivalent planktonic foraminiferal biozones;Zones E3 (P6a), E4 (P6b), E5 (P7), E6 (P8), and E7 or E7a were identified by analyzing twenty-eight samples from a 20 m thick section. Ten planktonic foraminiferal species belonging to seven genera and thirteen benthic foraminiferal species representing eleven genera were recorded. An Early Eocene age was assigned to the carbonate deposits exposed in Zgaimat Al-Hasah anticline based on some typical index species of calcareous planktonic foraminifera.
基金supported by the Basic Science Research Program through the National Research Foundation (NRF) of Korea funded by the Ministry of Education, Science and Technology (Grant No. 2012005044)
文摘Abundant conodont elements have been recovered from the Hwajeol Formation, to allow five zones to be erected： Proconodontus, Eoconodontus notchpeakensis, Cambrooistodus minutus, Cordylodus proavus, and Fryxellodontus inornatus-Monocostodus sevierensis-Semiacontiodus lavadamensis zones, in ascending order. More confident biozones are recognized in the Sesong Slate and lower Hwajeol Formation in the Makgol section, a part of the southern limb of the Baekunsan syncline, Taebaeksan Basin, Korea, especially focusing on the conodont biostratigraphic boundary of two units, and the subdivision potential of the previous ＂Proconodontus Zone＂, lowermost biozone of the Hwajeol Formation. Similarly, only a few conodont elements recovered from upper 14.5 m interval, namely the Furongian portion of the Sesong Slate, in the Makgol section did not allow erection of a biozone. Nevertheless, this part of the unit plus the basal 2.5 m interval of the Hwajeol Formation is characterized by the occurrence of Prooneotodus rotundatus（Druce and Jones）, Teridontus nakamurai（Nogami）, Phakelodus elongatus（An） and Phakelodus tenuis Müller. This interval marks the early Furongian ＂Prooneotodus rotundatus Zone＂. The rest of the measured section yielded relatively abundant conodonts, so three conodont biozones are proposed, based on the successive appearance of key species： Proconodontus tenuiserratus, Proconodontus posterocostatus, and Proconodontus muelleri zones, in ascending order, and thus allowing subdivision of the previous ＂Proconodontus Zone＂. The four conodont biozones are correlated with the relevant biozones of North and South China, and North America.
文摘IN the past 12 years, the Multidisciplinary Oceanographic Expedition Team to Nansha Islandsorganized by the Chinese Academy of Sciences has carried out many investigations and ob-tained a lot of scientific research results. In the present study, 177 surface sediments and 7core specimens were used for analyzing foraminifers, ostracods, radiolarians, bryozoans, gas-tropods, bivalves, diatoms, dinonagellates, sporopollen and calcareous nannoplankton, con-
