發(fā)布時間：2018-01-16 19:05

  本文關(guān)鍵詞：曹妃甸近岸及周邊海區(qū)碎屑礦物組成特征及其環(huán)境意義　出處：《海洋科學》2016年08期 　論文類型：期刊論文

  更多相關(guān)文章： 沉積物 碎屑礦物 組成特征

【摘要】：為探討曹妃甸近岸及周邊海區(qū)沉積物碎屑礦物組成特征以及曹妃甸大規(guī)模圍填海工程對其影響,作者對2013年10月采自曹妃甸及周邊海區(qū)的表層沉積物樣品采用輕重礦物分離的方法進行了鑒定。結(jié)果表明:大規(guī)模圍填海工程在改變曹妃甸岸線形態(tài)的同時也改變了其沖淤環(huán)境,使得碎屑礦物組分在大規(guī)模圍填海前后發(fā)生一定變化。研究區(qū)的沉積物整體以輕礦物為主,平均含量為97.83%,其中曹妃甸近岸平均含量為95.57%;重礦物平均含量為2.17%,其中曹妃甸近岸平均含量為4.43%。研究區(qū)的重礦物優(yōu)勢礦物主要有普通角閃石、綠簾石和自生黃鐵礦,其中普通角閃石所占比例在曹妃甸近岸達到最高值(36.41%);輕礦物的優(yōu)勢礦物主要有石英、斜長石和風化碎屑,其中石英所占比例也在曹妃甸近岸達到最高值(62.72%)。研究發(fā)現(xiàn),曹妃甸近岸沉積物碎屑礦物相對含量增加而重礦物基本不變,這在一定程度上揭示了大規(guī)模人工圍填海工程對曹妃甸近岸及周邊海區(qū)沉積環(huán)境的影響。
[Abstract]:In order to study the characteristics of clastic mineral composition of sediments in Caofeidian inshore and its surrounding sea area and the influence of large-scale reclamation project in Caofeidian. In October 2013, the surface sediment samples collected from Caofeidian and its surrounding sea areas were identified by the method of heavy and heavy mineral separation. The large-scale reclamation project has changed the shape of Caofeidian shoreline and the environment of scouring and silting at the same time. The composition of clastic minerals changes before and after large-scale reclamation. The sediment in the study area is mainly composed of light minerals with an average content of 97.83%. The average content of Caofeidian was 95.57m. The average content of heavy minerals is 2.17, of which the average content of Caofeidian is 4.43.The dominant minerals of heavy minerals in the study area are mainly common hornblende, verdant and authigenic pyrite. The proportion of common hornblende reached the highest value in Caofeidian inshore (36.41%). The dominant minerals of light minerals are mainly quartz plagioclase and weathered detritus in which the proportion of quartz has reached the highest value in Caofeidian inshore (62.72). The relative contents of clastic minerals in the sediments of Caofeidian inshore increased while the heavy minerals remained unchanged, which to some extent revealed the influence of large-scale artificial reclamation projects on the sedimentary environment of Caofeidian inshore and its surrounding sea areas.
【作者單位】： 魯東大學資源與環(huán)境工程學院;中國科學院煙臺海岸帶研究所;成都信息工程學院資源環(huán)境學院;青島大學環(huán)境科學與工程學院;
【基金】：中國科學院重點部署項目(KZZD-EW-14);中國科學院“一三五”規(guī)劃生態(tài)突破項目(Y254021031) 國家自然科學基金(41171424,41371104)~~
【分類號】：P736.3
【正文快照】： 海底表層沉積物中碎屑礦物的含量與分布情況復雜,影響因素較多。海底沉積環(huán)境取決于堆積環(huán)境中的水動力條件以及物理、化學和生物過程[1]。碎屑礦物是物源和環(huán)境的產(chǎn)物,也是搬運營力對沉積物長期作用的結(jié)果。因此,開展碎屑礦物研究對明確地質(zhì)環(huán)境及其演化有重要參考價值。特別

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