تحلیل تنش دیرینه گستره منصورآباد (جنوب باختر رفسنجان- استان کرمان) به روش وارونسازی چندگانه
الموضوعات :لیلا عبادی 1 , سید احمد علوی 2 , محمدرضا قاسمی 3
1 - دانشگاه شهید بهشتی
2 -
3 -
الکلمات المفتاحية: تحلیل تنش دیرینه روش وارونسازی چندگانه چندفازی رفسنجان.,
ملخص المقالة :
در این مقاله به ارزیابی و تحلیل تنش دیرینه در گستره منصورآباد، به روش وارونسازی چندگانه با اندازه گیری سطوح برشی دارای خطخش و صفحات گسلی در واحدهای سنگی مختلف، پرداخته میشود. به این منظور، در 18 ایستگاه براساس سن چینهشناسی واحدها، دادههای برشی برداشت شدند که مهمترین معیارهای مورد استفاده در تعیین سوی برش پلههای کانیایی، برشهای ریدل و بازشدگیهای کششی میباشند. براساس روش وارونسازی چندگانه که تنسور تنش را از دادههای گسلی ناهمگن (دادههایی بدون هیج شناخت قبلی از جهتگیری تنشها و یا طبقهبندی گسلها) آشکار میسازد، چهار پارامتر شکل بیضوی و محورهای تنش محاسبه گردید. در تفکیک فازهای صورت گرفته با این روش، عملکرد سه فاز تنش فشاری، کششی- برشی و برشی- فشاری مشخص گردید که جهتگیری محورهای تنش بیشینه در موقعیتهای مختلف گستره، تغییر روند از˚24N به˚ 162N را در دوره زمانی اواخر کرتاسه – نئوژن نشان میدهد در حالیکه تغییرات جهتگیری محور تنش کمینه از ˚ 79N به ˚116 Nمیباشد. براساس روند شمالباختری – جنوبخاوری گسلهای معکوس بهنظر میرسد که این گسلها، تحت تاثیر تنش فشاری بیشینه جهتگیری نمودهاند. با تغییر سازوکار فشاری به کششی- برشی، جایگیری رسوبات محلی صورت گرفته و در ادامه فرایند برش و تغییر جهتگیری تنش، چرخش بلوکی سبب ایجاد شکستگیها شده است و در اثر افزایش چرخش، ابعاد شکافها افزایش یافته و محل مناسبی جهت تزریق ماگما فراهم گردیده است.
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