Physicochemical Conditions during the Formation of Dalingkou Ag—Pb—Zn Deposit,Zhejiang Province |
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摘 要: |
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关 键 词: | 成矿条件 物理化学条件 浙江 银-铅-锌矿床 |
Physicochemical conditions during the formation of Dalingkou Ag-Pb-Zn deposit,Zhejiang Province |
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Authors: | Wei Yuanbo Chen Wu |
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Institution: | (1) Department of Earth Sciences, Nanjing University, 210008 Nanjing |
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Abstract: | On the basis of mineral paragenesis and the chemistry and homogenization temperatures of fluid inclusions, the physicochemical
parameters were calculated for the formation of the Dalingkou Ag-Pb-Zn deposit in Zhejiang. From the early to the late stage
of mineralization the ore-forming temperature venation was found to be 298.5 °C → 267.0 °C → 217.6 °C → 167.3 °C, with a corresponding
pH change of 3.0 ∼ 5.8 → 6.1 → 6.7→ 5.0 ∼ 7.3. The pressure changed from 403.8 to 128.5 atm, andlogf S2-9.9 → -11.2 → < -15; logf o2< -44→ -45.6 ∼ -42.6 → > -44.2; and logf co2 around -1.55.
In conjunction with geological observations, the deposit is considered to be of meso-epithermal origin, i.e., it was formed
after continental volcanic-subvolcanic activity. The major factors affecting ore precipitation are the decreasing temperature
and the increasing pH of ore-forming solutions. |
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Keywords: | physicochemical conditions for ore deposition Ag-Pb-Zn deposit Zhejiang Province |
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