相山火山盆地打鼓頂期火山機(jī)構(gòu)研究
發(fā)布時(shí)間：2018-12-20 11:46
【摘要】：江西相山火山盆地燕山期中期火山活動(dòng)頻繁,按巖漿活動(dòng)序次可分為打鼓頂期和鵝湖嶺期兩個(gè)亞旋回。早期巖漿活動(dòng)形成的打鼓頂組火山巖主要出露于盆地的西北緣,由于受晚期巖漿活動(dòng)破壞、火山巖的覆蓋,打鼓頂期的火山活動(dòng)特征、火山機(jī)構(gòu)的分布至今沒(méi)有統(tǒng)一認(rèn)識(shí)。因此作者在前人研究的基礎(chǔ)上,依托“相山火山盆地三維地質(zhì)調(diào)查”項(xiàng)目,選取相山火山盆地早白堊世打鼓頂期巖漿活動(dòng)作為主要研究對(duì)象。通過(guò)野外地質(zhì)調(diào)查收集了大量的流紋英安巖樣品及照片并大量測(cè)量熔巖中捕虜體產(chǎn)狀;打鼓頂組火山-沉積巖的地球化學(xué)特征、巖性巖相時(shí)空展布以及X巖石組構(gòu)圖等數(shù)據(jù)進(jìn)行研究,結(jié)合已有鉆孔資料分析,推測(cè)打鼓頂期古火山口、火山通道等火山機(jī)構(gòu)的分布,并參照前人遙感解譯的結(jié)果,對(duì)火山機(jī)構(gòu)進(jìn)行論證。根據(jù)室內(nèi)外綜合研究推斷相山火山盆地打鼓頂組的火山口位置,進(jìn)而分析其噴發(fā)類型及形成的地質(zhì)構(gòu)造環(huán)境,為相山火山盆地地質(zhì)演化研究提供素材。研究表明,打鼓頂組不同巖性及巖相的時(shí)空展布對(duì)火山機(jī)構(gòu)及噴發(fā)模式有著重要的研究意義。①打鼓頂組火山熔巖(流紋英安巖)巖層厚度及底板高度受地勢(shì)及受重力影響,結(jié)合其產(chǎn)狀,推測(cè)早期巖漿流動(dòng),從而反演火山通道位置;打鼓頂組火山碎屑巖中火山集塊巖對(duì)火山通道有著重要的指示意義,火山角礫巖中的角礫隨熔巖流動(dòng)造成捕擄體沿著某一特定方向排列,其長(zhǎng)軸方向指示巖漿的流動(dòng)方向。通過(guò)打鼓頂組火山-沉積巖特征推測(cè)的火山口位置與相對(duì)應(yīng)的遙感解譯的火山口位置基本一致。這些特征說(shuō)明利用巖性組合、巖石產(chǎn)狀及捕虜體產(chǎn)狀特征來(lái)指示火山口的大致位置是可行的。②利用內(nèi)打鼓頂組火山碎屑巖和熔巖巖層厚度數(shù)據(jù),可以計(jì)算火山爆發(fā)指數(shù),同時(shí)結(jié)合不同位置的巖相組合,確認(rèn)相山火山盆地內(nèi)打鼓頂期火山活動(dòng)強(qiáng)度,結(jié)合火山爆發(fā)指數(shù)推測(cè)火山通道位置。最終得出結(jié)論相山火山盆地打鼓頂期巖漿活動(dòng)主要受相山火山盆地基底的EW向隱伏斷裂控制。區(qū)域內(nèi)火山整體爆發(fā)指數(shù)較低,火山活動(dòng)較為平靜,盆地中部斷裂帶附近存在1個(gè)中心式噴發(fā)的主火山口,盆地北部存在5個(gè)火山噴發(fā)點(diǎn)底部次級(jí)斷裂相通形成復(fù)合式火山機(jī)構(gòu),形成了大量環(huán)狀、放射狀構(gòu)造。盆地東側(cè)、東南及南部地區(qū)均存在巖漿沿盆地打鼓頂早期火山活動(dòng)產(chǎn)生的的環(huán)狀斷裂上侵形成巖墻,打鼓頂組火山—沉積巖環(huán)繞盆地邊緣零星出露。
[Abstract]:There are frequent volcanic activities in the middle Yanshanian period in Xiangshan volcanic basin, Jiangxi Province. According to the order of magmatic activity, they can be divided into two subcycles: the Dagu top stage and the E Hu Ling period. The volcanic rocks of the Daguding formation formed by the early magmatic activities are mainly exposed to the northwestern margin of the basin. Due to the destruction of the late magmatic activities, the coverage of the volcanic rocks and the characteristics of the volcanic activities during the tamping period, the distribution of the volcanic bodies has not been uniformly recognized up to now. On the basis of previous studies, the author chooses the early Cretaceous thumping magmatic activity as the main research object based on the project of "Three-dimensional Geological Survey of Xiangshan Volcano Basin". Through the field geological survey, a large number of samples and photographs of streamline andesite were collected, and the occurrence of xenoliths in molten rock was measured. The geochemical characteristics of volcanic-sedimentary rocks in the Daguding formation, the temporal and spatial distribution of lithologic lithofacies and the composition of X rock formation are studied. The distribution of volcanic mechanisms such as the ancient crater and the volcanic channel in the Dagutingding period is inferred through the analysis of the existing drilling data. According to the results of remote sensing interpretation, the volcanic mechanism is demonstrated. The location of the crater of the Dagudding formation in Xiangshan volcanic basin is inferred according to the indoor and outdoor comprehensive studies, and the eruption type and geological tectonic environment are analyzed, which provides the material for the study of geological evolution of Xiangshan volcanic basin. The results show that the temporal and spatial distribution of different lithology and lithofacies of the Daguting formation is of great significance to the volcanic mechanism and the eruption model. 1 the thickness and the floor height of the volcanic lava (rhyolite andesite) of the Dagutingding formation are affected by the topography and gravity. According to its occurrence, the early magma flow can be inferred, and the location of volcanic channel can be retrieved. The volcanic aggregates in the clastic rocks of the Daguding formation play an important role in indicating the volcanic passageway. The breccia in the volcanic breccia is arranged along a certain direction with the flow of lava, and its long axis indicates the direction of magma flowing. The location of crater inferred from the characteristics of volcanic-sedimentary rocks of the Daguding formation is basically the same as that of the corresponding remote sensing interpretation of the crater. These characteristics indicate that it is feasible to use lithologic assemblage, rock occurrence and xenoliths to indicate the general location of the crater. 2 using the thickness data of volcanic clastic rock and lava strata of the Neda Dudding formation, the volcanic eruption index can be calculated. Combined with the lithofacies assemblage of different positions, the intensity of volcanic activity in the top stage and the location of the volcanic channel in the Xiangshan volcanic basin were confirmed and the volcanic eruption index was used to estimate the location of the volcanic channel. Finally, it is concluded that the magmatic activity in the topping stage of the Xiangshan volcanic basin is mainly controlled by the EW concealed faults in the basement of the Xiangshan volcanic basin. The whole volcanic eruption index in the region is relatively low, and the volcanic activity is relatively calm. There is a central eruption of the main crater near the central fault zone in the middle of the basin. In the northern part of the basin, there are five secondary faults at the bottom of the eruption point to form a composite volcanic mechanism, forming a large number of annular and radial structures. On the eastern, southeast and southern sides of the basin, magma transgressions along the annular faults caused by the early volcanic activities at the dagumping stage of the basin, and the volcanic-sedimentary rocks of the Daguting formation emerge sporadically around the margin of the basin.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P317
本文編號(hào)：2387952
[Abstract]:There are frequent volcanic activities in the middle Yanshanian period in Xiangshan volcanic basin, Jiangxi Province. According to the order of magmatic activity, they can be divided into two subcycles: the Dagu top stage and the E Hu Ling period. The volcanic rocks of the Daguding formation formed by the early magmatic activities are mainly exposed to the northwestern margin of the basin. Due to the destruction of the late magmatic activities, the coverage of the volcanic rocks and the characteristics of the volcanic activities during the tamping period, the distribution of the volcanic bodies has not been uniformly recognized up to now. On the basis of previous studies, the author chooses the early Cretaceous thumping magmatic activity as the main research object based on the project of "Three-dimensional Geological Survey of Xiangshan Volcano Basin". Through the field geological survey, a large number of samples and photographs of streamline andesite were collected, and the occurrence of xenoliths in molten rock was measured. The geochemical characteristics of volcanic-sedimentary rocks in the Daguding formation, the temporal and spatial distribution of lithologic lithofacies and the composition of X rock formation are studied. The distribution of volcanic mechanisms such as the ancient crater and the volcanic channel in the Dagutingding period is inferred through the analysis of the existing drilling data. According to the results of remote sensing interpretation, the volcanic mechanism is demonstrated. The location of the crater of the Dagudding formation in Xiangshan volcanic basin is inferred according to the indoor and outdoor comprehensive studies, and the eruption type and geological tectonic environment are analyzed, which provides the material for the study of geological evolution of Xiangshan volcanic basin. The results show that the temporal and spatial distribution of different lithology and lithofacies of the Daguting formation is of great significance to the volcanic mechanism and the eruption model. 1 the thickness and the floor height of the volcanic lava (rhyolite andesite) of the Dagutingding formation are affected by the topography and gravity. According to its occurrence, the early magma flow can be inferred, and the location of volcanic channel can be retrieved. The volcanic aggregates in the clastic rocks of the Daguding formation play an important role in indicating the volcanic passageway. The breccia in the volcanic breccia is arranged along a certain direction with the flow of lava, and its long axis indicates the direction of magma flowing. The location of crater inferred from the characteristics of volcanic-sedimentary rocks of the Daguding formation is basically the same as that of the corresponding remote sensing interpretation of the crater. These characteristics indicate that it is feasible to use lithologic assemblage, rock occurrence and xenoliths to indicate the general location of the crater. 2 using the thickness data of volcanic clastic rock and lava strata of the Neda Dudding formation, the volcanic eruption index can be calculated. Combined with the lithofacies assemblage of different positions, the intensity of volcanic activity in the top stage and the location of the volcanic channel in the Xiangshan volcanic basin were confirmed and the volcanic eruption index was used to estimate the location of the volcanic channel. Finally, it is concluded that the magmatic activity in the topping stage of the Xiangshan volcanic basin is mainly controlled by the EW concealed faults in the basement of the Xiangshan volcanic basin. The whole volcanic eruption index in the region is relatively low, and the volcanic activity is relatively calm. There is a central eruption of the main crater near the central fault zone in the middle of the basin. In the northern part of the basin, there are five secondary faults at the bottom of the eruption point to form a composite volcanic mechanism, forming a large number of annular and radial structures. On the eastern, southeast and southern sides of the basin, magma transgressions along the annular faults caused by the early volcanic activities at the dagumping stage of the basin, and the volcanic-sedimentary rocks of the Daguting formation emerge sporadically around the margin of the basin.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P317
【參考文獻(xiàn)】
相關(guān)期刊論文 前2條
1 何觀生;戴民主;李建峰;曹壽孫;夏斌;許德如;李文鉛;楊之青;;相山流紋英安斑巖鋯石SHRIMP U-Pb年齡及地質(zhì)意義[J];大地構(gòu)造與成礦學(xué);2009年02期
2 范洪海,凌洪飛,王德滋,沈渭洲,劉昌實(shí),姜耀輝;江西相山鈾礦田成礦物質(zhì)來(lái)源的Nd、Sr、Pb同位素證據(jù)[J];高校地質(zhì)學(xué)報(bào);2001年02期
，本文編號(hào)：2387952
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