本文選題：早白堊世 + 中基性火山巖�。� 參考：《中國科學(xué)院研究生院(廣州地球化學(xué)研究所)》2015年博士論文

【摘要】：華北東部早白堊世火山活動處于華北大規(guī)模巖漿活動的高峰期,良好地記錄了華北克拉通破壞過程中大陸下巖石圈地幔的熱-化學(xué)狀態(tài)。對華北東部早白堊世火山巖的研究能夠幫助更好地理解克拉通巖石圈減薄和破壞的時空演化規(guī)律及其深部地球動力學(xué)背景。本論文以山東和遼東地區(qū)早白堊世中基性火山巖為研究對象,通過40Ar-39Ar同位素定年精確厘定火山巖的時空分布特征,通過樣品全巖地球化學(xué)以及單礦物主量元素分析揭示巖漿源區(qū)的性質(zhì)、礦物組成、水含量以及富集和交代事件,進而探討克拉通破壞的深部動力學(xué)過程。研究結(jié)果表明,魯西地區(qū)青山組火山巖的噴發(fā)年齡為129~115 Ma,而膠東地區(qū)青山組火山巖的噴發(fā)時限為126~91 Ma。因此,魯西青山組火山巖的噴發(fā)時間早于膠東地區(qū)(約3 Ma),而且持續(xù)時間相對較短。遼東撫順小嶺組火山巖的噴發(fā)年齡為~110 Ma,明顯晚于山東青山組火山巖和遼西義縣組火山巖,暗示華北東部早白堊世巖漿活動的時空不均一性。魯西鄒平青山組火山巖以玄武安山巖和安山巖為主,并有少量玄武巖。鄒平安山巖的斑晶主要為高鈣和低鈣普通輝石、鈣鎂閃石和斜長石。角閃石溫壓計計算表明對應(yīng)的初始巖漿熔融溫度為916~943°C,與熔體平衡的水的含量(H2Omelt)為4.2~5.9 wt%。全巖樣品的Si O2=50.66~58.76 wt%、Mg O=1.68~10.52 wt%,樣品富集LILE,虧損HFSE,沒有明顯的Eu正異常,εNd(t)值變化較大(+0.1~-7.96),而87Sr/86Sr比值較一致(0.7043~0.7060),落在了EM1以及MORB與EM地幔演化趨勢線上。結(jié)果表明,鄒平青山組火山巖可能為軟流圈熔體與古老巖石圈地幔相互作用的產(chǎn)物。蒙陰青山組火山巖由玄武巖和安山巖組成。其中玄武巖的斑晶以透輝石和普通輝石為主,伴有斜長石。輝石韻律環(huán)帶發(fā)育,反映了巖漿的反復(fù)抽取-再補給過程。蒙陰安山質(zhì)巖的斑晶主要為鈣鎂閃石和鎂綠鈣閃石、普通輝石和斜長石。角閃石溫壓計計算表明蒙陰安山質(zhì)巖巖漿熔融溫度為880~973°C,與熔體平衡的水含量(H2Omelt)為2.6~5.4 wt%,較鄒平安山巖的低。玄武巖樣品的Si O2=50.4~51.8 wt%、Mg#=60.3~62.1,其Ti O2、Fe2O3t、Ca O、Mn O和Al2O3含量與方城玄武巖的接近;而安山質(zhì)巖樣品的Si O2=61.2~63.4 wt%、Mg#=50.3~56.1。玄武巖和安山質(zhì)巖樣品的87Sr/86Sr初始值分別為0.7093和0.7110,εNd(t)值分別為-10.5和-14.1,均落在EM2地幔區(qū)域內(nèi)。分析的蒙陰火山巖均富集LILE,虧損HFSE,其可能來源于受到俯沖揚子板片析出流體/熔體改造的富集巖石圈地幔的部分熔融。萊陽青山組火山巖主要由玄武安山巖和安山巖組成,斑晶主要為單斜輝石和斜長石。單斜輝石環(huán)帶發(fā)育,從核部到幔部,一般為正環(huán)帶,而從幔部到邊部則為反環(huán)帶。核部的Mg#值高達86,暗示了其與原始巖漿是平衡的。完整的正環(huán)帶-反環(huán)帶旋回反映了部分熔融過程中巖漿的不斷抽取-再補給過程。全巖樣品的Si O2=55.47~61.61 wt%,Mg O=3.48~5.74 wt%,富集LILE,虧損HFSE,顯示弱的Eu負(fù)異常,類似EM2的Sr-Nd組成(εNd(t)=-16.6~-17.6、87Sr/86Sr=0.7087~0.7110)。即墨青山組火山巖主要由玄武巖、玄武安山巖、粗面安山巖和英安巖組成,呈現(xiàn)雙峰式特征。分析的英安巖全巖樣品Si O2較高(62.49~66.57wt%)、Mg O(1.49~2.99 wt%)較低、Mg#值變化大(37.14~60.95)。樣品富集LILE,虧損HFSE,具有弱的Eu負(fù)異常,εNd(t)值和87Sr/86Sr初始值分別為-16.7~-17.2和0.70839~0.70843,與萊陽安山巖的接近。結(jié)果表明,萊陽和即墨青山組火山巖可能為受俯沖揚子板片析出流體/熔體改造的富集巖石圈地幔部分熔融的產(chǎn)物。遼東小嶺組火山巖由玄武巖、安山巖和英安巖組成,主要斑晶為橄欖石、透輝石、Mg-普通輝石、鎂綠鈣閃石和斜長石。角閃石溫壓計計算結(jié)果表明熔融巖漿溫度為902~968°C,與熔體平衡的水含量(H2Omelt)為3.9~6.5 wt%。全巖樣品的Si O2=45~62 wt%、Mg O=1.2~9.2 wt%、Ca O=1.8~10 wt%,富集LIL E,虧損HFSE,具有類似EM1的Sr-Nd組成(εNd(t)=-8.7~-16.0、87Sr/86Sr=0.7046~0.7054)。除Ti O2外,樣品的主量元素組成與在3~5 GPa實驗壓力條件下確定的無揮發(fā)分類似MORB的榴輝巖熔體的化學(xué)組成接近,但明顯不同于典型的無水橄欖巖熔體的組成特征,表明其來源于輝石巖源區(qū)的部分熔融。橄欖石高的Ni和Fe/Mn比值,及低的Ca含量同樣表明其來源于石榴石輝石巖地幔源區(qū)的部分熔融。該輝石巖源區(qū)可能與晚太古代-古元古代的地幔交代事件有關(guān),通過俯沖再循環(huán)地殼物質(zhì)與周圍橄欖巖的固相相互作用形成。華北東部晚三疊世-早白堊世巖漿巖時空分布特征表明巖石圈減薄和克拉通破壞在時空上是不均一的。晚三疊世巖漿活動可能對應(yīng)于揚子和華北板塊陸-陸碰撞造山后的伸展背景,暗示著華北東南緣在晚三疊世開始出現(xiàn)破壞;早-中侏羅世的巖漿活動可能與古太平洋向東亞大陸邊緣俯沖擠壓作用有關(guān)。早白堊世巖漿活動可能與古太平洋板塊俯沖方向改變及相應(yīng)的板片撕裂和后撤有關(guān)。華北早白堊世火山巖大量角閃石的出現(xiàn)暗示了太平洋板塊俯沖過程中大量的流體加入并交代富集巖石圈地幔。華北早白堊世火山巖的形成表明古太平洋俯沖及其析出流體(水)的交代作用對克拉通的破壞起到了重要作用。
[Abstract]:The early Cretaceous volcanism in eastern North China is in the peak period of large-scale magmatism in North China, which records the thermal and chemical state of the lower lithosphere mantle in the process of failure of the North China Craton. The study of Early Cretaceous volcanic rocks in eastern North China can help better understand the temporal and spatial evolution rules of the reduction and destruction of the cratonic lithosphere. In this paper, the basic volcanic rocks of the early Cretaceous in Shandong and Liaodong were studied in this paper. The characteristics of the space-time distribution of volcanic rocks were determined accurately by 40Ar-39Ar isotope dating, and the properties of the magma source area, mineral composition and water content were revealed by the total geochemistry of the samples and the analysis of the main elements of the single mineral elements. The results show that the eruption age of the Qingshan Formation volcanic rocks in the western Shandong Province is 129~115 Ma, and the eruption time of the Qingshan group volcanic rocks in Jiaodong area is 126~91 Ma., and the eruption time of the volcanic rocks in the Luxi Qingshan Formation is earlier than that of the Jiaodong region (about 3 Ma), and the eruption time of the volcanic rocks in the Western Qingshan Formation is earlier than that of the region (about 3 Ma). The eruption age of the volcanic rocks in the Fushun Xiaoling formation of Liaodong is ~110 Ma, which is obviously later than the volcanic rocks of the Qingshan group in Shandong and the volcanic rocks of the Yixian Formation in the west of Liaoning Province, suggesting that the magmatism of the early Cretaceous in the eastern part of North China is inhomogeneous. The volcanic rocks of the Zouping Qingshan Formation in the west of Luxi are mainly basaltic andesite and andesite, with a small amount of basalt. The speckles of rock. Zou Ping rocks are mainly high calcium and low calcium common pyroxene, calcite and plagioclase. The corresponding initial melting temperature of the hornblende indicates that the corresponding initial melting temperature of the magma is 916~943 C, and the content of the water in the equilibrium with the melt (H2Omelt) is Si O2=50.66 ~58.76 wt%, Mg O=1.68~10.52 wt%, and the sample is enriched. The loss of HFSE, there is no obvious Eu anomaly, and the value of the Nd (T) change is larger (+0.1~-7.96), and the 87Sr/86Sr ratio is consistent (0.7043~0.7060), which falls on the evolution trend of EM1 and MORB and EM mantle. The result shows that the volcanic rocks in the Qingshan Formation of Zouping may be the product of the interaction between the asthenosphere melt and the old lithospheric mantle. The volcanic rocks of the Qingshan Formation in Mengyin The basalts and andesite are composed of diopside and common pyroxene, accompanied by plagioclase and pyroxene rhythmic belt, which reflects the repeated recharge of the magma. The speckles of the Anshan rock in Mengyin are mainly calcite and magnesium calcite, ordinary pyroxene and plagioclase. The magma melting temperature of Yanshan rock is 880~973 C, and the water content (H2Omelt) is 2.6~5.4 wt% and lower than Zou Ping mountain. The Si O2=50.4~51.8 wt% of the basalt samples, Mg#=60.3~62.1, Ti O2, Fe2O3t, and the proximity of the square city basalt. The initial 87Sr/86Sr values of the basalt and Anshan rock samples are 0.7093 and 0.7110 respectively, and the values of the epsilon Nd (T) are -10.5 and -14.1 respectively in the EM2 mantle region. The analysis of the Mengyin volcanic rocks enriched LILE and lost HFSE, which may originate from the partial melting of the enriched lithosphere mantle transformed by the precipitated fluid / melt from the subducted Yangtze plate. The volcanic rocks of the Yang Qingshan Formation, mainly composed of basaltic andesite and andesite, are mainly monoclinopyroxene and plagioclase. The monoclinopyroxene belt is developed, from the nucleus to the mantle, which is generally a positive ring, but from the mantle to the edge. The Mg# value of the nucleus is up to 86, suggesting that it is balanced with the original magma. It reflects the continuous extraction and recharge process of the magma during partial melting. The Si O2=55.47~61.61 wt%, Mg O=3.48~5.74 wt% of the whole rock sample, the enrichment of LILE, the loss of HFSE, the weak negative Eu anomaly, the Sr-Nd composition of the EM2, which is mainly composed of Xuan Wuyan and Xuanwu mountain. Rock, rough andesite and anganite are characterized by Shuangfeng style. The analysis of Si O2 is higher (62.49~66.57wt%), Mg O (1.49~2.99 wt%) is lower, Mg# value is larger (37.14~60.95). Sample enrichment LILE, loss HFSE, weak Eu negative anomalies, epsilon values and initial values respectively The close of Laiyang andesite shows that the volcanic rocks in Laiyang and Jimo Qingshan Formation may be the product of partial melting of the enriched lithosphere mantle transformed by fluid / melt from the subducted Yangtze plate. The Liaodong Xiaoling formation is composed of Xuan Wuyan, andesite and anganite, and the main speckles are olivine, diopside, Mg- ordinary pyroxene, magnesium green calcium. The calculation results of the amphibole and plagioclase show that the molten magma temperature is 902~968 C, and the water content of the melts (H2Omelt) is Si O2=45~62 wt% of the whole rock samples of 3.9~6.5 wt%., Mg O=1.2~9.2 wt%. In addition to Ti O2, the composition of the main elements of the sample is close to the chemical composition of the eclogite melts without volatile components similar to MORB determined under the 3~5 GPa experimental pressure, but obviously different from the typical composition characteristics of the peridotite melts, indicating that they are derived from the partial melting of the pyroxene source region, the Ni and Fe/Mn ratios of olivine high, and the low C. The content of a also indicates that it originated from the partial melting of the mantle source area of the garnet pyroxenite. The pyroxene source area may be related to the late Archean Paleoproterozoic mantle metasomatism, and formed by the solid interaction of the subduction recirculating crustal substance and peridotite. The late three fold Early Cretaceous magmatic rocks in eastern North China were distributed in time and space. The sign indicates that the lithosphere thinning and cratonic failure are uneven in time and space. The late three superposition of the magmatism may correspond to the extension background of the Yangtze and North China plate continental collision orogenic orogeny, suggesting that the southeast margin of the North China began to occur at the beginning of the late three fold, and the early Middle Jurassic may be from the palaeopacific to the edge of the East Asia continent. The early Cretaceous magmatic activity may be related to the change of the subduction direction of the paleo Pacific plate and the corresponding plate tear and withdrawal. The emergence of a large number of hornblende in the early Cretaceous volcanic rocks in North China suggests a large number of fluids in the subduction of the Pacific plate and the metasomatism of the enrichment of the lithosphere mantle. The formation of the mountain rocks indicates that the subduction of the paleo Pacific Ocean and the metasomatism of the precipitation fluid (water) played an important role in the destruction of the craton.
【學(xué)位授予單位】：中國科學(xué)院研究生院(廣州地球化學(xué)研究所)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：P588.14;P597.3

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2 張均紅;華北克拉通中元古代基性巖墻群古地磁研究及其大地構(gòu)造意義[D];中國地質(zhì)大學(xué)(北京);2012年

3 張瑩瑩;用接收函數(shù)研究華北克拉通東北部地殼特性[D];中國地震局地震預(yù)測研究所;2013年

4 馮建陽;華北克拉通北太行山中生代似埃達克火山巖的成因[D];石家莊經(jīng)濟學(xué)院;2012年

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