本文選題：中揚(yáng)子臺(tái)地 + 下奧陶統(tǒng)　； 參考：《長(zhǎng)江大學(xué)》2015年碩士論文

【摘要】：深水環(huán)境下等深流沉積研究已經(jīng)過去50多年,在這50多年里雖然取得了一些成果,但對(duì)等深巖的形成機(jī)理和沉積環(huán)境研究較少。中揚(yáng)子臺(tái)地南側(cè)早奧陶世沉積格局穩(wěn)定,沉積相分區(qū)明顯,由西北至東南依次為淺水碳酸鹽巖臺(tái)地、深水斜坡和盆地沉積區(qū),整體上該區(qū)屬于華南古大陸邊緣帶成熟階段環(huán)境的一部分。該區(qū)不僅深水重力流沉積發(fā)育,而且深水等深流沉積也十分發(fā)育。對(duì)中揚(yáng)子臺(tái)地南側(cè)下奧陶統(tǒng)等深巖丘進(jìn)行研究,不僅可以豐富等深流沉積研究的內(nèi)容,促進(jìn)深水牽引流沉積研究的發(fā)展,而且對(duì)于等深巖的形成機(jī)理及重新認(rèn)識(shí)等深流形成時(shí)該地區(qū)古地理、古氣候和古大地構(gòu)造條件等也有重大意義,同時(shí)對(duì)于尋找該地區(qū)沉積礦產(chǎn)尤其是油氣的勘探具有重要的實(shí)際意義。本文通過野外剖面實(shí)測(cè)、詳細(xì)描述和碳氧同位素特征分析,對(duì)研究區(qū)形成等深巖的環(huán)流的特征、不同類型等深巖的形成環(huán)境有什么不同進(jìn)行了探索。在野外地質(zhì)工作的基礎(chǔ)上,以現(xiàn)代沉積學(xué)理論和海洋學(xué)中關(guān)于等深流沉積的理論為指導(dǎo),采取室內(nèi)宏觀與微觀研究相結(jié)合、常規(guī)分析與先進(jìn)的分析測(cè)試相結(jié)合的方法,對(duì)中揚(yáng)子臺(tái)地南側(cè)下奧陶統(tǒng)等深巖丘實(shí)例進(jìn)行重點(diǎn)解剖,深入研究其等深巖的類型及特征、沉積層序和縱橫向分布規(guī)律,并通過對(duì)等深巖地化指標(biāo)特征的測(cè)試結(jié)果分析,研究該區(qū)等深巖的形成機(jī)理及其形成時(shí)的古地形、古氣候、古鹽度等古環(huán)境條件。通過野外剖面實(shí)測(cè)和詳細(xì)研究,認(rèn)為中揚(yáng)子臺(tái)地南側(cè)下奧陶統(tǒng)盤家咀組為一套以灰色泥晶灰?guī)r、粉屑灰?guī)r、砂屑灰?guī)r和生物屑灰?guī)r為主的深水碳酸鹽巖沉積,主要發(fā)育垂向降落沉積、重力流沉積和等深流沉積3種沉積類型。根據(jù)巖性特征可將該等深流沉積劃分為灰泥等深巖、粉屑等深巖、砂屑等深巖、細(xì)礫屑等深巖和生物屑等深巖5種類型,其中灰泥等深巖尤為發(fā)育,砂屑等深巖、生物屑等深巖次之；并對(duì)其發(fā)育特征、碳氧同位素特征以及垂向?qū)有蜻M(jìn)行了歸納總結(jié)。研究表明,研究區(qū)主要存在由單一灰泥等深巖、單一生物屑等深巖、單一砂屑等深巖、生物屑等深巖與灰泥等深巖、砂屑等深巖與灰泥等深巖組成的5種不完整等深巖層序和極少的完整等深巖層序。在剖面上,根據(jù)等深巖發(fā)育類型及程度,將盤家咀組劃分為三部分,從第1部分至第Ⅲ部分,等深巖沉積厚度所占比例呈增大趨勢(shì)；結(jié)合區(qū)域沉積背景,認(rèn)為該地區(qū)早奧陶世盤家咀組沉積期等深流活動(dòng)的強(qiáng)度總體上呈由弱到強(qiáng)的變化規(guī)律。為了研究該等深流沉積形成時(shí)的古環(huán)境,分別對(duì)研究區(qū)不同類型等深巖與原地沉積進(jìn)行系統(tǒng)采樣做碳氧同位素分析。研究表明,工區(qū)下奧陶統(tǒng)盤家咀組等深巖的δ13C值分布于-0.83‰々2.31‰,δ13O值的范圍為-10.93‰～-9.54‰,Z值介于為120.82～127.14之間,T為16.98～24.81℃。與原地沉積相比,研究區(qū)等深巖的δ13C值、Z值、T值均較高,且隨著等深巖的粒度增大,其δ13C值、Z值、T值均逐漸增高；表明等深流沉積環(huán)境與原地沉積完全不同,等深巖主要形成于高鹽度的較深水環(huán)境中,且鹽度、水溫越高,越有助于高能等深流沉積物砂屑等深巖、生物屑等深巖的形成。等深巖層序的形成周期均表現(xiàn)為古鹽度、古水溫、海平面先增大后減小的周期性變化。
[Abstract]:Deep water sedimentary study has been studied for more than 50 years. Although some achievements have been made in the past 50 years, the formation mechanism and sedimentary environment of peer-to-peer deep rock are less studied. The sedimentary pattern of Early Ordovician in the southern side of the middle Yangtze platform is stable and the sedimentary facies is distinct, from the northwest to the southeast, the shallow water carbonate platform and the deep water slope are in turn. As a whole, the basin is part of the mature stage of the paleo continental margin of Southern China. This area is not only deep-water gravity flow deposition and development, but also deep deep flow deposits are also very well developed. The development of the research on water tractive flow deposition is of great significance to the paleogeography, paleoclimate and paleotectonic conditions in the formation of the deep stream, as well as the formation mechanism and re understanding of the deep rocks. At the same time, it is of great importance to the exploration of the deposits in this area, especially the exploration of oil and gas. A detailed description and analysis of carbon and oxygen isotopes have been made to explore the characteristics of the circulation of the deep rocks in the study area and the difference in the forming environment of different types of deep rocks. On the basis of the field geological work, with the theory of modern sedimentology and the theory of the deep flow deposition in oceanography, the indoor macro and micro research is taken. Combined with the combination of the conventional analysis and the advanced analysis and testing method, the lower Ordovician deep rock colliculus in the southern side of the middle Yangtze platform are dissected, and the types and characteristics of the deep rock, the depositional sequence and the vertical and horizontal distribution law are studied, and the test results of the characteristics of the index characteristics of the peer-to-peer deep rock geochemistry are analyzed, and the study area and so on are studied. The formation mechanism of deep rock and its paleoclimate, paleoclimate, paleosalinity and other paleoenvironmental conditions. Through field survey and detailed study, it is believed that the lower Ordovician Pan Jia Tsui formation on the southern side of the middle Yangtze platform is a set of deep-water carbonate deposits mainly of gray muddy limestone, silt limestone, sand clastic limestone and bioclastic limestone. There are 3 types of sedimentary types: vertical descent deposition, gravity flow deposition and equal deep flow deposition. According to the lithologic characteristics, the same deep flow deposits can be divided into 5 deep rocks, such as plaster, deep rock, sand and other deep rocks, fine gravel and other deep rocks, such as deep rock and other deep rocks, of which the plaster and other deep rocks are particularly developed, sand and other deep rocks, and other deep rocks, and so on. The characteristics of its development, carbon and oxygen isotopes and vertical sequences are summarized. The study shows that there are 5 incomplete sequences and poles of deep rocks composed of deep rocks such as single plaster, single biochip and other deep rocks, single sand and other deep rocks, deep rocks such as deep rock and plaster, sand and other deep rocks such as plaster and other deep rocks. In the section, according to the type and degree of the development of the same deep rock, the Pan Jia Tsui formation is divided into three parts. From the first to the third part, the proportion of the sedimentary thickness of the deep rock is increasing, and the sedimentary background of the region is considered to be the overall intensity of the deep flow activity in the early Ordovician of the early Ordovician. In order to study the Paleoenvironment in the formation of the same deep flow deposits, the carbon and oxygen isotopes of different types of deep rocks and original deposits in the study area are systematically sampled and analyzed. The study shows that the delta 13C value of the deep rock in the lower Ordovician of the Ordovician of the Ordovician is 2.31 per thousand and the range of the delta 13O value is -10.93. The value of Z is between 120.82 and -9.54 per thousand, and the value of Z is between 120.82 and 127.14 and 16.98 ~ 24.81 C. Compared with the original deposit, the delta 13C value, Z value and T value of the deep rock in the study area are all higher, and with the increase of the granularity of the isodeep rocks, the delta 13C value, Z value and T value are all increased gradually, indicating that the sedimentary environment of the equal depth is completely different from the original deposit, and the isodeep rock is mainly formed at the high level. In the deepwater environment of salinity, the higher the salinity, the higher the water temperature, the more helpful to the formation of deep rock and other deep rocks such as the high energy and other deep stream sediments. The formation period of the sequence of the same deep rock is manifested by the paleo salinity, the paleo water temperature, and the decrease of the sea level and then the decrease of the periodicity.
【學(xué)位授予單位】：長(zhǎng)江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P534.42

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