Iranian Journal of Crystallography and Mineralogy
مجله بلورشناسی و کانی شناسی ایران
www.ijcm.ir
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1726-3689
2588-4719
10.61186/ijcm
fa
jalali
1399
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1
gregorian
2020
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نقش منطقهبندی بلورهای فلدسپار در تفسیر دگرگونی ماگمایی توده گرانیتوئیدی گوشه (جنوب شرق بروجرد)
The role of feldspar crystals zoning in interpreting the magmatic evolution of the Goushe granitoid Pluton (SE of Boroujerd)
تخصصي
Special
پژوهشي
Research
<span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">توده گرانیتوئیدی گوشه در جنوب شرق بروجرد </span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">دارای ترکیب گرانیت، گرانودیوریت و</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">برونبوم­­های ریزدانه­ای با ترکیب گرانودیوریت تا کوارتزمونزودیوریت است. </span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">حضور</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">این برونبوم­ها</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">به</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">همراه شواهدی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">از</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">بافتهای</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">غیرتعادلی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">چون</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">لبه انحلالی و منطقهبندی در پلاژیوکلازها، بافت غربالی، لختههای مافیک، بیوتیت تیغهای، بافت خال­خال فلدسپار قلیایی و آپاتیت سوزنی نشان دهنده شرایط ناپایدار و غیرتعادلی در محیط تبلور بوده که به احتمال بسیار در اثر صعود سریع ماگما و یا فرآیند آمیختگی ماگما ایجاد شده است</span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">. بلورهای</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">فلدسپار</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">قلیایی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">و</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">پلاژیوکلاز</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">سنگهای</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">نفوذی گوشه</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">از</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">دید</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">ترکیب</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">و</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">بافتی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">ساختار منطقهای</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">نشان</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">میدهند. ترکیب شیمیایی پلاژیوکلازها</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">سنگهای</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">گرانیتوئیدی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">گستره میان </span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">اوا</span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">یل</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">آلبیت</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">(</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;">An: 2</span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">)</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">لبه</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">تا</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">اوا</span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">یل</span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;"> آندزین</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">(</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;">An: 33</span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">) در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">مرکز</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">و</span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;"> ترکیب</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">پلاژیوکلاز</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">برونبوم­ها</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">گستره</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">به</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">نسبت</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">گستردهتری از اوایل الیگوکلاز (</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;">An: 11</span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">) تا</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">او</span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">اسط </span></span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">آندزین (</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;">An: 36</span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">) تغییر می­کند. ترکیب</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">فلدسپار قلیایی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">سنگهای</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">گرانیتوئیدی با درصد ارتوکلاز</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;"> Or<sub> = </sub>94 - 97 </span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">و</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">برونبوم­ها با</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;"> Or <sub>= </sub>69 - 96 </span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">مشخص</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">شده</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">است</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;">.</span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;"> فراوانی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">عناصر</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">کمیاب</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;"> Fe </span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">،</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;">Sr </span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">،</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;">Ba </span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;"> و</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;"> Mg </span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">فلدسپارها، الگوی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">نوسانی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">نشان</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">میدهند</span></span></span><span style="font-family:Times New Roman;"><span style="font-size:11.0pt;">.</span></span><span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;"> الگوی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">نوسانی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">عناصر</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">اصلی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">و کمیاب</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">از</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">مرکز</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">به</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">لبه</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">بلور</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">فلدسپار</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">به</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">نقش</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">مؤثر</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">پدیده</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">آمیختگی ماگمایی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">در</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">شکل­گیری</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">توده</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">گرانیتوئیدی</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">گوشه</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">اشاره</span></span></span> <span dir="RTL"><span style="font-family:Nazanin;"><span style="font-size:12.0pt;">دارد. </span></span></span>
The Goushe granitoid Pluton is located southeast of Boroujerd. The study area is composed of granite, granodiorite and the microgranular enclaves located in it with the granodiorite to quartzmonzodiorite combination. The microgranular enclaves presence along with evidence of the presence of the non-equilibrium textures such as dissolved margin and plagioclase zoning, sieve textures, mafic clots, blade biotite, feldspar Poikilitic texture indicate the unstable conditions and imbalance in the crystallization environment that probably has been created due to rapid ascent of magma or magma mixing process. Alkaline feldspar and plagioclase crystals in the Goushe intrusive rocks show zoning structure in terms of composition and texture. Feldspar crystals were analyzed in different units such as granodiorite, monzogranite and microgranular enclaves, which are relatively abundant throughout the granitoid intrusion. The plagioclase chemical composition in granitoid rocks changes in the compositional range of albite (An: 2) at the edge to Andzin (An: 33) in the center and the enclavesn plagioclase composition of in a wider range fluctuates from early oligoclase (An: 11) to mid-andesine (An: 36). The alkaline feldspar composition is determined in granitoid rocks with Or = 94-97 and in the enclave with Or = 69-96. The abundance of trace elements Fe, Sr, Ba and Mg in feldspars show an oscillating and variable pattern. The trace and rare elements oscillation pattern from the center to the margin in the feldspar crystal indicates the effective role of the magmatic mixing phenomenon in the formation of the Goushe Pluton.
فلدسپار؛ منطقهبندی؛ آمیختگی ماگمایی؛ گوشه؛ بروجرد.
Feldspar, Zoning, Magmatic mixing, Goushe, Boroujerd
771
788
http://ijcm.ir/browse.php?a_code=A-10-44-444&slc_lang=fa&sid=1
Mousavi
سیده اسما
موسوی
10031947532846009798
10031947532846009798
No
دانشگاه لرستان
Tahmasbi
زهرا
طهماسبی
10031947532846009799
10031947532846009799
Yes
دانشگاه لرستان
Sarjoughian
فاطمه
سرجوقیان
10031947532846009800
10031947532846009800
No
دانشگاه کردستان
Ahmadi Khalaji
احمد
احمدی خلجی
10031947532846009801
10031947532846009801
No
دانشگاه لرستان
Zare Shooli
معصومه
زارع شولی
10031947532846009802
10031947532846009802
No
دانشگاه لرستان