pan lang="EN-US">The types and lithology characters of Permian dolomitic clastic rocks in northwestern Junggar Basin are investigated by means of petrologic analysis, Xpan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">pan>pan lang="EN-US">ray indentification, carbon and oxygen isotope geochemistry and element geochemistry analysis, also analyzed Dolomization mechanism, Established dolomitization model. dolomitic clastic rocks in study areas include dolomitic mudstone, dolomitic siltstone, dolomitic tuffaceous siltstone, dolomitic tuffaceous shale,ect. And dolostones which are formed through dolomitization by replacing lacutrine plaster and siliceous pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">（pan>pan lang="EN-US">tuffaceouspan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">）pan>pan lang="EN-US"> components mainly consist of powderpan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">pan>pan lang="EN-US">fine dolomites with automorphic or hypidiomorphic crystals, while residual calcite and late filled calcite cement commonly exist. The ratio of V/ Nipan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">（pan>pan lang="EN-US">1.2pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">～pan>pan lang="EN-US">4.8pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">）pan>pan lang="EN-US">content of Srpan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">（pan>pan lang="EN-US">95.5pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">～pan>pan lang="EN-US">782.2 pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">μpan>pan lang="EN-US">g/gpan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">）pan>pan lang="EN-US">Mg/Capan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">（pan>pan lang="EN-US">0.5pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">～pan>pan lang="EN-US">3.0pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">）pan>pan lang="EN-US">,the degree of orderpan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">（pan>pan lang="EN-US">0.36~0.98pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">）δpan>pan lang="EN-US">18OPDBpan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">（pan>pan lang="EN-US">14.8pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">‰～pan>pan lang="EN-US">3.2pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">‰）pan>pan lang="EN-US">and pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">δpan>pan lang="EN-US">13CPDBpan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">（pan>pan lang="EN-US">1pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">‰～pan>pan lang="EN-US">5.2pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">‰）pan>pan lang="EN-US">all have larger variation range. The dolomitic rocks in this area mainly formed in a relatively weak hydrodynamic conditions, deep, peaceful, salt and lowpan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">pan>pan lang="EN-US">salt semipan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">pan>pan lang="EN-US">closed terrestrial bay environment, have a characteristic of several stages and various causes. During Permian periods, in the researching zone the tectonics is complex, fault development, subtropical hot climate and frequent volcanic which provide favourable source of Mg2pan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">＋pan>pan lang="EN-US"> and permeability channel for the rich magnesium fluid fast flow. Comprehensive research show that these dolomitic rocks have three kinds of genetic typespan>pan style="font-family: 宋体; mso-ascii-font-family: ’times new roman’; mso-hansi-font-family: ’times new roman’">：pan>pan lang="EN-US"> Penecontemporaneous dolomitization, buried dolomitization, hydrothermal dolomitization.pan>
