甘肃寨上金矿床1:5万水系沉积物测量综合评价

1:50 000 Stream Sediment Survey Integrative Appraisa in Zhaishang Gold Deposit,Gansu Province

常规1∶5万水系沉积物测量工作仅圈定了异常范围,进行简单评价。通过对寨上—申都成矿带内的6个综合异常进行重新评价,对每个综合异常进行单独评价,利用MapGIS技术,重新绘制等值线图,按照动态圈定异常方法,使异常形态与地质要素套合,进行合理解释。在寨上—申都成矿带内圈定综合化探异常6个,综合评价后认为:(1)Hs7-1综合异常内,他路—小寨一带是有利成矿部位。(2)Hs7-2综合异常内,底固—陈家湾一带是成矿有利地区。(3)Hs7-3综合异常内成矿条件较为有利。(4)Hs7-4综合异常内划分出4个异常带。异常带整体呈NW向展布,似等间距分布,基岩发育区异常发育,厚覆盖区异常不发育。分析寨上异常带(Ht-Ⅰ)后认为,寨上村以北F1断裂以南地区有望发现新的矿脉。沟麻背—纳纳牧场异常带(Ht-Ⅱ)和卓洛—扎麻树异常带(Ht-Ⅲ)内,厚覆盖区内异常指示着深部仍然有望找到新的矿脉。堡子山—护林梁异常带(Ht-Ⅳ)内31号脉规模还应更大,异常南侧应进行地质调查。(5)Hs7-5综合异常内,义仁沟口—石家台一带山梁上下二叠统石里墩组内、国营牛场—华林沟脑的中泥盆统西汉水群和上泥盆统大草滩群内有望发现新矿脉。(6)Hs7-6综合异常内,应对常家山一带的几条异常进行查证。通过重新评价寨上—申都成矿带内6个综合异常,缩小了找矿靶区,使下一步的找矿工作更具有针对性和可操作性。

1：50 000 stream sediment survey only delineate the abnormal range, give simple appraisal.Through the Zhaishang-Shendu ore belt anomaly re-integrative appraisal,a separate appraisal of six integrative geochemical anomaly were done.By using MapGIS technology to re-draw the contour map,fit the abnormal morphology and geo- logical elements,in accordance with the dynamic delineation of abnormal method,to give a reasonable explanation. Integrative appraisal show that six integrative geochemical exploration anomaly were delineated in Zhaishang- Shendu ore belt：（ 1 ）in the Hs7-1 integrative anomaly area,favorable ore-forming parts is Talu-Xiaozhai belt.（2） in the Hs7-2integrative anomaly area, Digu-Chenjiawan belt is of better mineralization.（ 3 ）in the Hs7-3 integrative anomaly area,metallogenic conditions are better than the other anomaly area.（4）the Hs7-4 integrative anomaly area are divided into four anomaly belt, and the anomaly belt is as a whole showed a northwest trending, and with a similar equidistant distribution.In Bedrock development area, anomaly is development,in thick-covering area, the anomaly is not developed.Based on the analysis of the Zhaishang anomaly belt（Ht- I ）,we suggest that the area in north of Zhaishang village,south of the F~ fracture,is expected to find new ore vein.In Goumabei-Nana pasture anomaly belt（Ht-II） and Zhuoluo-Zhamashu anomaly belt （Ht-III）,geoehemieal anomaly in thick-covering area indicating there is still hope to find new veins in deep.The scale of 31 ore vein in Buzi mountain-Hulinliang anomaly belt （Ht-IV）should be larger,Geological Survey should be done in south side of the anomaly.（5）It is ex- petted to find new ore vein within the Renyigoukou-Shijiatai one belt ridge of Permian Shilidun,up and down group strata,the Devonian Xihanshui Group in Guoying cattle farm-Hualingounao,and Late Devonian Daeaotan Group strata,in Hs7-5 integrative anomaly.（6）It is neeessatT to verify a few geochemical anomaly in Changjiashan belt,HsT-6 integrative anomaly.The six integrative geochemical exploration anomaly delineated by the appraisal Zhaishang-Shendu ore belt narrowed to find the target,so the next step in the prospecting work more operational. Re-evaluation of the six integrative geochemical exploration anomaly in Zhaishang-Shendu ore zone,we narrowed the prospecting targets, to make the future work more targeted and operability.