MARGIN: 0cm 0cm 0pt; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto; mso-pagination: widow-orphan; mso-outline-level: 2" class=MsoNormal>rial" lang=EN-US>Characteristics of Saddle Dolomite Cements in the Cambrian-Ordovician Carbonates in Tabei and Tazhong area of ml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />me w:st="on">Tarimme> Basinmso-bidi-font-family: 宋体; mso-font-kerning: 18.0pt" lang=EN-US>ml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

• 责任者：Wang Dan (Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Wang Xu
• 刊名：Chinese Journal of Geology
• 出版年：2010
• 卷期：45(2)
• 关键词：碳酸盐岩 ; carbonate rocks ; 白云石 ; dolomite ; 塔里木盆地 ; Tarim Basin
• 页码：p.580-594
• 图表：4 illus., 2 plates, 3 tables, 44 refs.
• 分类号：0803
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

MARGIN: 0cm 0cm 0pt 36pt; mso-pagination: widow-orphan" class=MsoNormal>mso-font-kerning: 0pt" lang=EN-US>ml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

m 0cm 0pt 36pt; mso-pagination: widow-orphan" class=MsoNormal>mso-font-kerning: 0pt" lang=EN-US>Detailed researches of Cambrian-Ordovician dolostones in Tabei and Tazhong areas of Tarim Basin demonstrated widespread presence of saddle dolomite cements, which commonly occur as cements(or infilling)in vugs and/or fractures. These dolomite crystals, generally 500 μm up to ml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />metcnv w:st="on" UnitName="mm" SourceValue="6" HasSpace="True" Negative="False" NumberType="1" TCSC="0">6 mmmetcnv> in size, are creamy white non-planar crystals with curved or lobate or stepped crystal faces. mso-spacerun: yes"> The data suggest that the saddle dolomites could have formed in thermal brine. Compared with saddle dolomites of other basins all over the world, the saddle dolomites of me w:st="on">Tarimme> Basin have similar δmetcnv w:st="on" UnitName="C" SourceValue="13" HasSpace="False" Negative="False" NumberType="1" TCSC="0">¹³Cmetcnv> and δ¹⁸O values, but lower ⁸⁷Sr/⁸⁶Sr ratios. The reason could be that the saddle dolomites were formed in magmatic hydrothermal, which was mantle-derived and reached carbonate formation accompanying igneous intrusion or through discordogenic faults without going through siliciclastic sediments.