ساختارهای زمینشناسی و نقش آنها در کنترل کانیسازی در محدوده معدنی سرب و روی بهرامتاج، یزد، ایران مرکزی | ||
| پژوهشهای دانش زمین | ||
| دوره 12، شماره 2 - شماره پیاپی 46، مرداد 1400، صفحه 206-225 اصل مقاله (5.31 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.52547/esrj.12.2.206 | ||
| نویسندگان | ||
| کاظم قلی زاده* 1؛ ایرج رساء1؛ محمد یزدی1؛ ماریا بونی2 | ||
| 1گروه زمینشناسی، دانشکده علوم زمین، دانشگاه شهید بهشتی، تهران، ایران | ||
| 2گروه ژئوفیزیک و آتش فشان شناسی، دانشگاه ناپل، ایتالیا | ||
| چکیده | ||
| محدوده معدنی سرب و روی بهرامتاج در 90 کیلومتری شمالغرب شهر یزد و 10 کیلومتری جنوبغرب عقدا، استان یزد قرار دارد. از لحاظ موقعیت زمینشناسی معدن بهرامتاج در زون ایران مرکزی قرار میگیرد. سنگهای رخنمون یافته در معدن شامل سازندهای عقدا، لالون و واحدهای تفکیک نشده پرکامبرین تا کامبرین (سری دزو) است. کانسنگ موجود در محدوده متشکل از لنزها، رگهها و رگچههای غیرسولفیدی روی و سرب مانند کانیهای اسمیتزونیت، همیمورفیت، هیدوزینکیت، سروزیت و به مقدار کمتر کانیهای سولفیدی سرب مانند گالن و اکسیدهای مس (مالاکیت، بچرریت و اوریکلسیت) هستند که در سنگهای آهکی- دولومیتی پالئوزوئیک (بین شیل-کربنات یا توالیهای کربناته) تشکیل شدهاند. توالیهای سنگی منطقه تحتتأثیر گسلهای ناحیهای از جمله گسلهای شمال فخرآباد (رورانده- معکوس با مولفه راستالغز راستگرد) و گسل امتدادلغز راستگرد نائین- سورک و شکستگیهای مرتبط با آنها که روند غالب شمالشرقی- جنوبغربی تا شرقی- غربی را دارا هستند، قرار گرفتهاند. لنزها و رگههای کانیسازی سرب و روی به خصوص کانیهای غیرسولفیدی روی در مناطق گسل، زونهای برشی و چینخورده بهطور واضح دیده میشود. مطالعات زمین ساختی نشان داد که گسترش کانیسازی روی و سرب در راستای گسلشهای شمالغربی- جنوبشرقی بیانگر تاثیر کششی مربوط به سیستم شکستگی شمالغرب- جنوبشرق است، که سبب شده تا در پهنههای کششی مرتبط با این سیستم، کانیسازی سرب و روی گسترش بیشتری داشته باشد. گسلهای شمال شرق- جنوبغرب که جوانتر از گسلهای دیگر بوده، نقش نسبتا کمتری در کانیسازی غیرسولفیدی داشته ولی غالبا باعث جابجایی پهنههای کانیسازی شدهاند. | ||
| کلیدواژه‌ها | ||
| ایران مرکزی؛ چین‌خوردگی؛ کانیسازی سرب و روی؛ گسل‌ها؛ محدوده معدنی بهرامتاج | ||
| عنوان مقاله [English] | ||
| Geological structures and their role in control of mineralization in Bahramtaj Lead and Zinc deposit, Yazd province, Central Iran | ||
| نویسندگان [English] | ||
| Kazem Gholizadeh1؛ Iraj Rasa1؛ Mahammad Yazdi1؛ Maria Boni2 | ||
| 1Department of Geology, Faculty of Earth Science, Shahid Beheshti University of Tehran, Tehran, Iran | ||
| 2Department of Geophysic and Vulcanology, University of Napoli, Italy | ||
| چکیده [English] | ||
| Extended Abstract Introduction Iran has large areas of carbonate rocks that host potential reserves of lead and zinc deposits due to suitable geodynamic conditions and carbonate platforms. So far, more than 300 zinc-lead deposits have been reported with sedimentary hosts in Iran. Bahramtaj lead and zinc deposit is located in Central Iran zone, which is hosted by Precambrian-Cambrian formations (Rizo, Dezo and Aqda). In this paper, an attempt has been made to present the structural formation model of Bahramtaj lead and zinc mineralization by combining the results obtained from the study of geological structures, the relationship between structures and specific mineralization. Materials and methods In this study, various geological structures such as faults, joints and folds at the local scale as well as in the Bahramtaj prospect area have been studied. After identifying the main and important structures influencing the region, the structural and tectonic status of Bahramtaj area, the relationship between geological structures and mineralization are also studied. Due to the availability of Google Earth images with an approximate accuracy of 30 meters, as well as the use of digital topographic images with an accuracy of 30 meters and ETM + images, and using remote sensing software, the tectonic position of the region has been discussed. Results and Discussion Faults Existence of different generations of faults and fractures each related to a generation across fault zones has caused confusion and complexity of rock units in Bahramtaj mining area. Investigation of fault zones and geological structures related to fault movements (formation of fracture zones, fault gouge and fault breccia) in the faults of the area indicate their formation in fragile and shallow environments. The main stress trends of the region based on diagrams related to faults and fractures of the region, indicate their compliance with the stress distribution due to the performance of the main faults in the region, which are N044 and N337 in the direction of maximum stress in the region. Folds In Bahramtaj mining area, different changes in the type of deformation have occurred at different times. In the oldest rocks of the area, which are most exposed in the northern parts, Cambrian carbonate units show at least two generations of folds and various types of open and closed folds, inverted and asymmetrical in different scales. In most cases, the old corrugated edges are limited and broken by longitudinal faults, and due to the undertaken different stresses in different directions, a lot of rotation has occurred in the direction of their axis and geometry. Considering the structural condition of the region and the distribution of stress based on the existing structural evidence in the range and geometry of the folds of the younger generations, it is possible to imagine older clockwise rotation trends for this generation of the folds of the range. Regarding the formation, the folds of the area have been affected by the performance of the main fault in the region. Therefore, the predominant direction of the folds, show the azimuth N120. Conclusion Based on field evidence and studies, it was found that mineralization coincided with the activity of the strike-slip fault with a northwest-southeast direction. The development and expansion of mineralization in different regions in the two systems are different. Expansion of zinc and lead mineralization in the direction of northwest-southeast faults express the positive effect of east-west fault activity on the number of openings. Creation of convenient places in tensile fractures related to the northwest-southeast fracture system, has caused lead and zinc mineralization to be more widespread in the tensile zones associated with this system. | ||
| کلیدواژه‌ها [English] | ||
| Zink and lead mineralization, Bahramtaj mining district, Faults, Folds, Central Iran | ||
| مراجع | ||
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