Barite-Fluorite Mineralization in Southeast Sichuan, Yangtze Block, China

1. INTRODUCTION<p>1.1 SIGNIFICANCE</p>

<p>1.2 STATE OF THE ART RESEARCH</p>

<p>1.2.1 STATE OF THE ART RESEARCH ON FLUORITE </p>

<p>1.2.1.1 Resource status of fluorite</p>

<p>1.2.1.2 State of the art research of fluorite deposit characteristics</p>

<p>1.2.2 STATE OF THE ART RESEARCH ON BARITE</p>

<p>1.2.2.1 Resource status of barite</p>

<p>1.2.2.2 State of the art research of barite deposits</p>

<p>1.2.3 STATE OF THE ART RESEARCH ON FLUORITE OF THE STUDY AREA</p>

1.3 THE SCIENTIFIC PROBLEM<p></p>

<p>1.4 RESEARCH IDEAS AND RESEARCH CONTENT</p>

<p>1.4.1 RESEARCH IDEAS</p>

<p>1.4.2 RESEARCH CONTENT</p>

<p>2. GEOLOGICAL SETTING</p>

<p>2.1 GEOTECTONIC SETTING</p>

<p>2.1.1 PALEOZOIC TO EARLY DEVONIAN TECTONIC EVOLUTION</p>

<p>2.1.2 MIDDLE DEVONIAN TO EARLY PERMIAN TECTONIC EVOLUTION</p>

<p>2.1.3 LATE PERMIAN TO MIDDLE TRIASSIC TECTONIC EVOLUTION</p>

<p>2.1.4 LATE TRIASSIC TO EARLY CRETACEOUS TECTONIC EVOLUTION</p>

<p>2.1.5 LATE CRETACEOUS TO PRESENT TECTONIC EVOLUTION</p>

<p>2.2 REGIONAL STRATIGRAPHIC CHARACTERISTICS</p>

<p>2.2.1 PRE-CAMBRIAN</p>

<p>2.2.3 CAMBRIAN</p>

<p>2.2.4 ORDOVICIAN</p>

<p>2.2.5 MIDDLE-LOWER SILURIAN</p>

<p>2.3 REGIONAL STRUCTURAL CHARACTERISTICS</p>

<p>2.3.1 FOLD ORE CONTROL STRUCTURE SYSTEM</p>

<p>2.3.2 FAULT STRUCTURE SYSTEM</p>

<p>3. PETROLOGICAL CHARACTERISTICS AND SEDIMENTARY ENVIRONMENT</p>

3.1 PETROLOGICAL CHARACTERISTICS<p></p>

<p>3.1.1 CLASTIC ROCKS AND SHALE</p>

<p>3.2.2 CARBONATE</p>

<p>3.2 SEDIMENTARY ENVIRONMENT</p>

<p>4. MINERALIZATION BELTS AND GEOLOGICAL CHARACTERISTICS OF DEPOSITS</p>

<p>4.1 DISTRIBUTION CHARACTERISTICS OF MINERALIZATION BELTS</p>

<p>4.2 GEOLOGICAL CHARACTERISTICS OF TYPICAL DEPOSITS</p>

<p>4.2.1 LANGXI HUOSHIYA BARITE-FLUORITE DEPOSIT</p>

<p>4.2.1.1 Strata</p>

<p>4.2.1.2 Structure</p>

4.2.1.3 Ore body characteristics<p></p>

<p>4.2.1.4 Ore characteristics</p>

<p>4.2.1.5 Wall rock alteration</p>

<p>4.2.2 FENGJIA BARITE-FLUORITE DEPOSIT</p>

<p>4.2.2.1 Strata</p>

<p>4.2.2.2 Structure</p>

<p>4.2.2.3 Ore body characteristics</p>

<p>4.2.2.4 Ore characteristics</p>

<p>4.2.2.5 Wall rock alteration</p>

<p>4.2.3 TAIJI BARITE-FLUORITE DEPOSIT</p>

<p>4.2.3.1 Strata</p>

4.2.3.2 Structure<p></p>

<p>4.2.3.3 Ore body characteristics</p>

<p>4.2.3.4 Ore characteristics</p>

<p>4.2.3.5 Wall rock alteration</p>

<p>4.2.4 HONGHUALING BARITE-FLUORITE DEPOSIT</p>

<p>4.2.4.1 Strata</p>

<p>4.2.4.2 Structure</p>

<p>4.2.4.3 Ore body characteristics</p>

<p>4.2.4.4 Ore characteristics</p>

<p>4.2.4.5 Wall rock alteration</p>

<p>5. ELEMENT GEOCHEMISTRY</p>

5.1 SAMPLE COLLECTION AND ANALYSIS<p></p>

<p>5.2 GEOCHEMICAL CHARACTERISTICS OF TRACE ELEMENTS</p>

<p>5.3 GEOCHEMICAL CHARACTERISTICS OF REES</p>

<p>5.3.1 CHARACTERISTICS OF REE IN FLUORITE AND BARITE</p>

<p>5.3.2 CHARACTERISTICS OF REE IN ORE-BEARING SURROUNDING ROCKS</p>

<p>5.4 DISCUSSION</p>

<p>5.4.1 REE PATTERNS</p>

<p>5.4.2 ΔEU AND ΔCE</p>

<p>5.4.3 REE VARIATION DIAGRAMS</p>

<p>5.4.3.1 La/Ho vs Y/Ho</p>

<p>5.4.3.2 Tb/Ca vs Tb/La</p>

<p>5.3.2.3 La/Yb vs ∑REE</p>

<p>6. ORE-FORMING FLUIDS</p>

<p>6.1 FLUID INCLUSION GEOCHEMISTRY</p>

<p>6.1.1 PETROGRAPHIC CHARACTERISTICS OF FLUID INCLUSIONS</p>

<p>6.1.2 HOMOGENIZATION TEMPERATURE AND SALINITY</p>

<p>6.1.3 FLUID INCLUSION DENSITY</p>

<p>6.2 PRESSURE ESTIMATION OF FLUID INCLUSIONS</p>

<p>6.2.1 PRESSURE ESTIMATION AND MINERALIZATION DEPTH</p>

<p>6.2.1.1 Driesner and Heinrich equation</p>

<p>6.2.1.2 Bischoff phase diagram method</p>

<p>6.2.1.3 Shao Jielian's empirical formula</p>

<p>6.2.1.4 Liu Bin’s isometric equation</p>

<p>6.2.2 DEGREE OF EROSION</p>

<p>6.2.3 OXYGEN FUGACITY ANALYSIS</p>

<p>6.3 VAPOR AND LIQUID COMPOSITION OF FLUID INCLUSIONS</p>

<p>6.3.1 GAS PHASE COMPOSITION</p>

<p>6.3.2 LIQUID PHASE COMPOSITION</p>

<p>6.4 LA-ICP-MS ANALYSIS OF SINGLE FLUID INCLUSIONS</p>

<p>7. ISOTOPE GEOCHEMISTRY</p>

<p>7.1 H-O ISOTOPIC CHARACTERISTICS</p>

<p>7.2 S ISOTOPIC CHARACTERISTICS</p>

<p>7.3 SR ISOTOPIC CHARACTERISTICS</p>

<p>7.3.1 SR ISOTOPIC COMPOSITIONS OF THE HOST ROCK</p>

<p>7.3.2 SR ISOTOPIC COMPOSITION OF FLUORITE AND BARITE</p>

<p>7.3.3. THE SOURCE OF CA AND BA</p>

<p>7.4 SM-ND ISOTOPIC CHARACTERISTICS</p>

<p>8. THE SOURCE AND REGULARITY OF MINERALIZATION</p>

<p>8.1 SOURCE OF THE ORE-FORMING FLUIDS</p>

<p>8.2 SOURCE OF THE ORE-FORMING MATERIALS</p>

<p>8.3 AGE OF THE MINERALIZATION</p>

<p>8.4 MINERALIZATION STAGE AND MINERAL FORMATION SEQUENCE</p>

<p>8.4.1 PRE-ORE STAGE</p>

<p>8.4.1.1 Sedimentary-diagenetic enrichment substage of the basin</p>

<p>8.4.1.2 Precipitation and deep-cycle leaching enrichment subperiod</p>

<p>8.4.2 SYN-ORE STAGE</p>

<p>8.4.2.1 Barite-fluorite mineralization stage (I)</p>

<p>8.4.2.2 Carbonate stage (Ⅱ)</p>

<p>8.4.3 POST-ORE STAGE</p>

<p>8.5 ZONING OF ORE BODIES AND MINERALIZATION MODEL</p>

<p>8.5.1 VERTICAL ZONATION OF THE ORE BODIES</p>

<p>8.5.1.1 Spatial zoning characteristics of the altered roof of the barite-fluorite ore body</p>

<p>8.5.1.2 Spatial zoning characteristics of the ore body at the head of barite-fluorite deposits</p>

<p>8.5.1.3 Spatial zoning characteristics of the upper ore body in barite-fluorite deposits</p>

<p>8.5.1.4 Spatial zoning characteristics of the central ore body in barite-fluorite deposits</p>

<p>8.5.1.5 Spatial zoning characteristics of the lower ore body in barite-fluorite deposits</p>

<p>8.5.1.6 Spatial zoning characteristics of the tail ore body in barite-fluorite deposits</p>

<p>8.5.2 MINERALIZATION MODEL</p>

<p>8.6 MINERALIZATION REGULARITY</p>

<p>8.6.1 THE SPATIOTEMPORAL EVOLUTION OF THE MINERALIZATION BELT</p>

<p>8.6.2 THE TEMPORAL AND SPATIAL EVOLUTION OF THE ORE BODIES</p>

<p>CONCLUSION</p>

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