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首頁(yè)> 外文學(xué)位 >Eocene calcareous nannofossil biostratigraphy, paleoecology and biochronology of ODP leg 122 hole 762c, eastern Indian Ocean (Exmouth Plateau).
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Eocene calcareous nannofossil biostratigraphy, paleoecology and biochronology of ODP leg 122 hole 762c, eastern Indian Ocean (Exmouth Plateau).

機(jī)譯：印度洋東部（?？怂姑┧垢咴㎡DP腿122孔762c的始新世鈣質(zhì)納米化石生物地層學(xué)，古生態(tài)學(xué)和生物年代學(xué)。

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摘要

A relatively complete section of Eocene (∼33.9-55.8 Ma) pelagic chalk from offshore northwestern Australia was used to analyze range and abundance data of ∼250 Eocene species to test the efficacy of the existing CP (Okada and Bukry 1980) and NP (Martini 1971) biostratigraphic zonation schemes. Changes in nannofossil diversity, abundance, and community structure were monitored through several Eocene paleoenvironmental events, as identified by changes in delta13C and delta18O data, to examine variations in surface water conditions. Major changes in nannofossil assemblages, as indicated by dominance crossovers, correspond to paleoenvironmental shifts such as the Paleocene-Eocene Thermal Maximum and the Early Eocene Climatic Optimum. This research also provides systematic paleontology and range data for nine new species and one new genus, and addresses several taxonomic issues in other Eocene species.;Examination of the calcareous nannofossil biostratigraphy (Section I) showed several potential hiatuses within the stratigraphic section at Hole 762C. The presence of these hiatuses was supported by cross-correlation of planktonic foraminiferal P-zones, magnetostratigraphic reversals and delta13C and delta18O isotopic excursions. A portion of the dissertation was conducted to fulfill the need for a new, integrated age model for Hole 762C, utilizing biostratigraphic, magnetostratigraphic, and stable isotopic data published in the Leg 122 Initial Reports (Haq et al. 1990) and Scientific Results (von Rad et al. 1992) with the calcareous nannofossil data generated in Section I. This new age model allowed revision of sedimentation rates at Site 762, and these revised rates were used to estimate the ages of calcareous nannofossil bioevents, which are compared to several additional, globally distributed localities.
機(jī)譯：來(lái)自澳大利亞西北海域的一個(gè)較完整的始新世（?33.9-55.8 Ma）上層白堊巖段被用于分析?250個(gè)始新世物種的范圍和豐度數(shù)據(jù)，以測(cè)試現(xiàn)有CP（Okada和Bukry 1980）和NP（馬提尼）的功效。 1971年）的生物地層分區(qū)方案。通過(guò)幾個(gè)始新世古環(huán)境事件來(lái)監(jiān)測(cè)納米化石多樣性，豐度和群落結(jié)構(gòu)的變化，這些變化由delta13C和delta18O數(shù)據(jù)的變化確定，以檢查地表水狀況的變化。如優(yōu)勢(shì)轉(zhuǎn)換所示，納米化石組合的主要變化對(duì)應(yīng)于古環(huán)境變化，如古新世-始新世熱最大值和早期始新世氣候最佳。這項(xiàng)研究還為9個(gè)新物種和一個(gè)新屬提供了系統(tǒng)的古生物學(xué)和范圍數(shù)據(jù)，并解決了其他始新世物種中的幾個(gè)分類(lèi)學(xué)問(wèn)題。 。浮游有孔蟲(chóng)的P區(qū)，磁地層反轉(zhuǎn)和δ13 C和δ18 O同位素偏移的互相關(guān)性支持了這些裂隙的存在。論文的一部分是為了滿(mǎn)足對(duì)762C井齡的新的綜合年齡模型的需要，利用了在Leg 122初次報(bào)告（Haq等人，1990年）和《科學(xué)成果》（馮）中發(fā)表的生物地層學(xué)，磁性地層學(xué)和穩(wěn)定同位素?cái)?shù)據(jù)Rad等（1992）使用第一部分中生成的鈣質(zhì)納米化石數(shù)據(jù)。該新年齡模型允許對(duì)762號(hào)站點(diǎn)的沉積速率進(jìn)行修訂，并將這些修訂后的速率用于估算鈣質(zhì)納米化石生物事件的年齡，并將其與其他幾個(gè)事件進(jìn)行比較。 ，分布在全球各地。

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  • 作者

    Shamrock, Jamie L.;

  • 作者單位

    The University of Nebraska - Lincoln.;

  • 授予單位 The University of Nebraska - Lincoln.;
  • 學(xué)科 Paleontology.;Paleoclimate Science.;Sedimentary Geology.
  • 學(xué)位 Ph.D.
  • 年度 2010
  • 頁(yè)碼 159 p.
  • 總頁(yè)數(shù) 159
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類(lèi)
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