首頁> 外文學(xué)位 >I) Trace element and strontium isotopic geochemistry of accessory mineral phases and the origin of epizonal silicic intrusive igneous rocks. II) Electrochemistry of lead-doped molten silicate glasses and the development of new ion sources for thermal ionization mass spectrometry.

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I) Trace element and strontium isotopic geochemistry of accessory mineral phases and the origin of epizonal silicic intrusive igneous rocks. II) Electrochemistry of lead-doped molten silicate glasses and the development of new ion sources for thermal ionization mass spectrometry.

機(jī)譯：I）輔助礦物相的微量元素和鍶同位素地球化學(xué)以及上層硅質(zhì)侵入性火成巖的成因。 II）摻雜鉛的熔融硅酸鹽玻璃的電化學(xué)以及用于熱電離質(zhì)譜的新型離子源的開發(fā)。

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Exactly how silicic magmas are generated in the shallow continental crust remains a significant issue. This study addresses the role of accessory minerals and crystal-liquid separation in producing silicic magmas associated with the Organ Needle pluton (ONP), NM. In-situ trace element determinations were used to assess the origin of titanite from the inequigranular syenite (IEQ) of the ONP. The IEQ was previously interpreted as a cumulate related to production of silicic melt at the ONP. Titanites from the IEQ are light rare earth element (LREE) enriched ((La/Yb)N= 10-60). The removal of titanite could account for LREE depletion observed in associated silicic igneous rocks. Eu/Eu* and Sr concentrations suggest that titanites are not in chemical equilibrium and represent cumulates formed at different times and from parental magma batches that were juxtaposed after crystallization.;In-situ Sr isotopic analysis via thermal ionization mass spectrometry (TIMS) was performed to determine the source for volcanic units at the ONP, the Squaw Mt. Tuff (SMT), and the West Side Lavas (WSL), and to confirm the hypothesis that the alkali feldspar granite (AFG) was produced by progressive assimilation followed by transport. 87Sr/ 86Sr(i) vs. 1/Sr shows evidence that the WSL cores isotopically match plutonic units: IEQ, AFG, and a mafic enclave. In-situ Sr data also supports the hypothesis that the AFG is isotopically equivalent to the SMT. In both cases, data points to differentiation and magma removal at depth.;We also initiated efforts to generate a high-efficiency TIMS ion source using electrochemical techniques. Typical ionization efficiencies range from 0.1% to 10%. We produced voltammograms in a volatilizing electrolyte at high temperatures under vacuum conditions and argon atmosphere. Under argon, the voltammograms display peaks that may correspond to the Pb to Pb + reaction. An initial condition is that the glass is a molten conductor. Resistivities of these glasses range from 428.15 O-m (unleaded borosilicate, vacuum, 1390 deg C) to 9.73 O-m (leaded borosilicate, argon, 1200 deg C), an order of magnitude higher than reported values. High resistivities could be due to bubble formation in those glasses. Suggestions for future users include miniaturizing the cell to minimize bubble formation and to mimic conditions of the TIMS.

機(jī)譯：硅質(zhì)巖漿在淺層大陸殼中究竟是如何產(chǎn)生的仍然是一個重要的問題。這項(xiàng)研究探討了輔助礦物和晶體-液體分離在產(chǎn)生與NM器官針狀巖體（ONP）有關(guān)的硅質(zhì)巖漿中的作用。原位痕量元素測定用于評估ONP的不等方正長巖（IEQ）中鈦礦的來源。 IEQ先前被解釋為與ONP處硅質(zhì)熔體產(chǎn)生有關(guān)的累積量。來自IEQ的鈦礦富含輕稀土元素（LREE）（（La / Yb）N = 10-60）。鈦鐵礦的去除可以解釋在相關(guān)的硅質(zhì)火成巖中觀察到的輕稀土消耗。 Eu / Eu *和Sr的濃度表明鈦酸鹽不處于化學(xué)平衡狀態(tài)，代表在不同時間形成并在結(jié)晶后并置的母體巖漿中形成的堆積。;通過熱電離質(zhì)譜（TIMS）進(jìn)行了原位Sr同位素分析確定ONP的Squaw山火山單位的來源。凝灰?guī)r（SMT）和西側(cè)拉瓦斯（WSL），并確認(rèn)以下假設(shè)：堿長石花崗巖（AFG）是通過逐步同化然后運(yùn)輸而產(chǎn)生的。 87Sr / 86Sr（i）與1 / Sr對比的證據(jù)表明，WSL核與同位素單元匹配，即IEQ，AFG和鎂鐵質(zhì)飛地。原位Sr數(shù)據(jù)也支持AFG在同位素上等同于SMT的假設(shè)。在這兩種情況下，數(shù)據(jù)都指向深處的分化和巖漿清除。；我們還開始努力使用電化學(xué)技術(shù)生成高效的TIMS離子源。典型的電離效率為0.1％至10％。我們在高溫，真空條件和氬氣氣氛下在揮發(fā)的電解質(zhì)中制作了伏安圖。在氬氣下，伏安圖顯示的峰可能對應(yīng)于Pb到Pb +反應(yīng)。初始條件是玻璃是熔融導(dǎo)體。這些玻璃的電阻率范圍從428.15 O-m（無鉛硼硅酸鹽，真空，1390攝氏度）到9.73 O-m（含鉛硼硅酸鹽，氬氣，1200攝氏度），比報(bào)告值高一個數(shù)量級。高電阻率可能是由于這些玻璃中形成氣泡所致。對未來用戶的建議包括使電池小型化以最大程度地減少氣泡形成并模仿TIMS的狀況。

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作者
Cheversia, Mary Beth.;
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作者單位

University of Colorado at Boulder.;

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授予單位 University of Colorado at Boulder.;
學(xué)科 Geology.;Geochemistry.
學(xué)位 Ph.D.
年度 2010
頁碼 135 p.
總頁數(shù) 135
原文格式 PDF
正文語種 eng
中圖分類
關(guān)鍵詞

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I) Trace element and strontium isotopic geochemistry of accessory mineral phases and the origin of epizonal silicic intrusive igneous rocks. II) Electrochemistry of lead-doped molten silicate glasses and the development of new ion sources for thermal ionization mass spectrometry.

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