本文選題：蘇魯大別超高壓變質(zhì)帶 + 榴輝巖�。� 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：大別蘇魯超高壓變質(zhì)帶是三疊紀(jì)由中朝板塊和楊子板塊俯沖碰撞的產(chǎn)物,為全球規(guī)模最大的超高壓變質(zhì)帶之一,是近二十年,全世界地質(zhì)專家研究的重點(diǎn)課題。我國(guó)地質(zhì)科學(xué)家通過(guò)巖石學(xué)、礦物學(xué)、地球化學(xué)、年代學(xué)等其他研究手段取得了豐碩的成果,使我國(guó)對(duì)超高壓變質(zhì)帶的認(rèn)知有很大的提升。南黃海北部千里巖隆起區(qū)屬于蘇魯高壓-超高壓變質(zhì)帶(許志琴,2006),千里巖島是千里巖隆起的海上出露區(qū),是蘇魯造山帶的重要組成部分,由于千里巖島位于蘇魯-大別造山帶與朝鮮半島之間這樣的特殊的地理位置,并且在千里巖島發(fā)現(xiàn)榴輝巖,其可能為大別-蘇魯造山帶延伸至朝鮮半島的重要線索。論文取得以下主要認(rèn)識(shí):(1)根據(jù)巖石學(xué)特征,千里巖島榴輝巖礦物世代可劃分為:第一世代礦物組合:石榴石中的綠輝石、金紅石及綠簾石包體,代表了深俯沖進(jìn)變質(zhì)的階段。第二世代礦物組合:有石榴石、多硅白云母、綠輝石、及其金紅石,代表高壓榴輝巖相峰期變質(zhì)組合。第三世代礦物組合:主要由透輝石、鈉長(zhǎng)石、石英、角閃石等石榴石退變邊及綠輝石的后成合晶構(gòu)成,說(shuō)明了角閃巖相退變質(zhì)階段的礦物組合。第四世代礦物組合:主要由礦物邊緣及裂隙中的綠泥石、石英及黑云母構(gòu)成,說(shuō)明了綠片巖相退變質(zhì)階段礦物組合。(2)礦物學(xué)特征表明,石榴石總體上富Alm,貧Spe組分,五個(gè)端元組分含量分別為:Alm (42.07～52.72%),Spe (0.57～1.21), And (0.61 ～3.47), Pyr(18.22～29.82), Gro (21.19～28.26)。根據(jù)石榴石的成分剖面(圖4-2)可以看出,從核部到邊部,XMg先上升,然后下降,XMg的變化反映了溫度先升高后降低的過(guò)程,XFe總體上輕微下降,XCa則表現(xiàn)為逐漸上升,單斜輝石大多數(shù)為綠輝石,部分為后成合晶中的透輝石。綠輝石內(nèi)部基本沒(méi)有包體,早期的綠輝石包體中的硬玉組分(35%)到基質(zhì)中綠輝石的硬玉組分(40%-45%),再到后成合晶中透輝石的硬玉含量(10—14%)。角閃石主要是鈉-鈣質(zhì)和鈣質(zhì)角閃石,以變斑晶存在于基質(zhì)當(dāng)中的主要是韭閃石,以后成合晶以及退變邊存在的主要是鎂普通角閃石,陽(yáng)起石則主要存在于裂隙當(dāng)中。多硅白云母只存在于基質(zhì)當(dāng)中,內(nèi)部不見(jiàn)任何包體,在BSE圖中不存在不均勻的分區(qū)現(xiàn)象,成分大體上均勻,多硅白云母由核部向邊部,Si4+有輕微的增加。(3)本文通過(guò)采用地質(zhì)溫壓計(jì),榴輝巖的峰期溫度應(yīng)用Ravna(2000)的Grt-Cpx溫度計(jì),榴輝巖的峰期壓力采用Waters and Martin( 1993 )的Grt-Omp-Phe壓力計(jì),并進(jìn)行聯(lián)合求解,峰期溫度為755-759℃,壓力為2.69-2.76GPa。本文采用 Waters and Matrin (2001) Amp-Di-Pl 壓力計(jì)和 Holland and Blundy (1994)的Amp-Pl溫度計(jì),得到了角閃巖相退變質(zhì)階段溫度為580-605℃,壓力為1.1-1.3Gpa。通過(guò)礦物邊緣及裂隙中的綠泥石、石英、黑云母礦物組合,筆者推斷其處于綠片巖相變質(zhì),其溫壓條件應(yīng)當(dāng)為:T450℃, P0.3Gpa。(4)年代學(xué)數(shù)據(jù)表明,繼承鋯石的加權(quán)平均年齡以及表面年齡可以確定,千里巖榴輝巖的原巖形成時(shí)代為新元古代,兩組樣品(Q3、QⅢ)的變質(zhì)成因鋯石的加權(quán)平均年齡(231.4±3.3Ma,231.3±4.3Ma)和其下交點(diǎn)年齡(228.0±7.5,231.0±4.2)基本一致,應(yīng)代表千里巖榴輝巖的峰期變質(zhì)年齡。
[Abstract]:The Dabie Sulu ultrahigh pressure metamorphic belt is the product of the Triassic subduction and collision of the Sino Korean plate and the Yang Zi plate. It is one of the largest ultrahigh pressure metamorphic belts in the world. It is the key topic of the geological experts all over the world in the past twenty years. In the northern part of the South Yellow Sea, the thousand li rock uplift area belongs to the Su Lu high pressure superhigh pressure metamorphic zone (Xu Zhiqin, 2006), the thousand li Rock Island is an outcropping area of the thousand li rock uplift, an important part of the Su Lu orogenic belt, and the thousand li Rock Island is located in the Su Lu Dabie orogenic belt. Such special geographical location with the Korean Peninsula, and the discovery of Eclogite in the thousand li Rock Island, may be an important clue to the Dabie Su Lu orogenic belt extending to the Korean Peninsula. The following main understanding: (1) according to the petrological characteristics, the garnet mineral assemblage of the first generation can be divided into the first generation mineral assemblage: garnet The diopside, rutile and epidote xenoliths represent the stage of deep dive into the metamorphic stage. The second generation mineral assemblage: garnet, polysilicon muscovite, oroxene, and rutile, representing the peak metamorphic combination of the high pressure eclogite facies. The third generation mineral assemblage: mainly from diopside, sodium feldspar, quartz, hornblende and other garnet edge and green. The retroxectic composition of the pyroxene illustrates the mineral assemblage of the phase of the amphibolite phase retrograde metamorphism. The fourth generation mineral assemblage is composed mainly of chlorite, quartz and biotite in the mineral edge and fissure, indicating the mineral assemblage in the phase of the phase retrogression of the green schist. (2) the mineralogical characteristics indicate that the garnet is generally rich in Alm, poor Spe component and five ends. The components of the tuples are as follows: Alm (42.07 ~ 52.72%), Spe (0.57 ~ 1.21), And (0.61 ~ 3.47), Pyr (18.22 to 29.82) and Gro (21.19 to 28.26). According to the composition profile of garnet (Fig. 4-2), it can be seen that XMg rises first and then decreases from the nucleus to the edge, and the change of XMg reflects the process that the temperature rises first and then decreases, and XFe is generally slightly lower. Descending, XCa is gradually rising, and most of the monoclinopyroxene is diopside, part of the Diopside in the posterior diopyroxene. There are basically no inclusions inside the diopyroxene, the early jadeite component in the early omroxene inclusion (35%) to the jadeite component (40%-45%) in the matrix, and then the diopside content of the diopside (10 - 14%). If sodium calcium and calcareous amphibole, the main part of the matrix in the matrix is leek amphibole, and then the main form of eutectic and degenerative edge is magnesium common amphibole, and the allimite mainly exists in the crack. The polysilicon Muscovite exists only in the matrix and does not have any inclusions in the interior, and there is no inhomogeneous distribution in the BSE diagram. The composition of the region is generally uniform, and the polysilicon Muscovite is slightly increased from the nucleus to the edge. (3) by using the geological thermometer, the peak temperature of the eclogite is applied to the Grt-Cpx thermometer of Ravna (2000), the peak pressure of the eclogite adopts the Grt-Omp-Phe pressure meter of Waters and Martin (1993), and the peak temperature of the peak period is solved jointly. The degree is 755-759 degrees C, the pressure is 2.69-2.76GPa., the Amp-Pl thermometer of Waters and Matrin (2001) Amp-Di-Pl pressure meter and Holland and Blundy (1994) is used. The temperature of the phase of amphibolite phase retrograde metamorphism is 580-605 C, the pressure is a combination of chlorite, quartz and black mica mineral in the mineral edge and fissure of 1.1-1.3Gpa.. It is inferred that the temperature and pressure conditions should be: T450 C, P0.3Gpa. (4) geochronological data show that the weighted average age of the inherited zircon and the surface age can be determined, the age of the Proterozoic era of the garnet eclogite is Neoproterozoic, and the weighted average age of the metamorphic zircons of the two groups of samples (Q3, Q III) is 231.4 + 3.3Ma, 23 1.3 + 4.3Ma) is basically consistent with the age of the lower internode (228 + 7.5231.0 + 4.2). It should represent the peak age of the Eclogite in the thousand li rock.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P588.3

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