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Register a new userStudy of tectonic subsidence in the southern Naher Al-Kabir Al- Shimaly basin
دراسة الهبوط التكتوني في جنوب حوض نهر الكبير الشمالي
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يهدف هذا البحث إلى تحديد التطور التكتوني لحوض نهر الكبير الشمالي من خلال منحني الهبوط التكتوني المحسوب من معطيات بئر اللاذقية 1. تم تحديد هبوط تكتوني في الجوراسي الأسفل-الأوسط مرتبط بانفتاح حوض المتوسط الشرقي. تبعه هبوط تكتوني طفيف في السينومانيان بعد مرحلة نهوض في الجوراسي الأعلى-الكريتاسي الأسفل المرتبط بعوامل طي و حت معروفة على مستوى إقليمي.
The aim of this research is to identified the tectonic evolution of Naher Al-Kabir Al-Shimaly Basin from tectonic subsidence curve witch calculated from Lattakia1 well data. Tectonic subsidence was identified in lower-middle Jurassic en relation of opening of East Mediterranean basin. A subsidence is occurred in Cenomaniane, after a stage of uplift in late Jurassic-lower Cretaceous en relation to fold and erosion known at regional scale.
References used
ADJIMAN J. and KHATOUN A. 1999 The geology of Syria. Explanatory Notes on the Geological Map of Lattakia, scale 1:50000. Ministry of petroleum and resources of the Syrian Arab Republic
ATHY L.F. 1930 Density, Porosity and compaction of sedimentary rocks. The American Association of Petroleum Geologists Bulletin. Vol14, pp1-24
AL-JASSIM A.K. 1969 Stratigraphy and tectonic of Nahr Alkabir Alshmali Depression, Report on the geological survey, Damascus
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Study of the general characteristics of Fractures in the central part of
the AL-Kabir AL- Shimali river basin showed the presence of
several main groups of Fractures with directions NE-SW _ NNESSW,
NW-SE , E-W.and showed increased fracture rate in
the
northern and southern parts of the study area, and that the spacing
between the Fractures close to the medium convergence (5-34) cm ,
also show a aperture ranged between (0.1-5.1) cm, where aperture
width was increased in southwest of Lake 16 October near Lattakia-
Kless fault .
Middle Miocene deposits reveal the form of outcrops which are limited in area on
the northern boards of the basin of AL-KABEER Al-Shemaly River. It is characterized by
a large and fast changes in thickness and facies.
This study focused on the res
ults of careful Fossile analysis of 41 samples (hard and
soft) which were taken from the three geological sections, through which the principal
zones, which characterize middle Miocene, were confirmed depending on planktonic
foraminifera.
N9, -Orbulina suturalis-Globerotalia peripheroronda
N10-N13-Globerotalia fohsi, Sphaaerodinellopsis subdehiscens- Globigrina drury ,
N14 – Globigerina nepenthes- Globerotalia siakensis.
It was identified as benthic foraminifera, which has been characterized by its
diversity and their increasing numbers in the northern boards of the Neogene basin and
identify the lithology of these deposits consisting of alternations of limestone and
limestone of medium hardness to very soft marl with different colors.
This study also contributed to the detection of some paleogeographical development
in the basin in that period of time.
The lithological study and micropaleontological analyses of 21 samples
taken from four geological sections of lower Miocene deposits led to a
stratigraphic study for determination of enrichment of planktonic species in
these deposits . These speci
es were combined with biozones of lower miocene
and their stratigraphic distribution in the studied sections according to
planktonic foraminifera of worldwide spreading . This study contributed in
understanding of paleogeographic development of Neogene basin within this
period of time , which appeared as a marine progress in lower Miocene ,
which continued up to upper Miocene in the northwestern part of Syria . The
sediments of lower Miocene consisted of marl , clay marl deposits with
interfacial layers of clay and limestones or marl limestones deposited
unconformithy with nummoliticlimestones of Eocene , or cretaceous
carbonates rich in betome sometimes .
This study deals with spatial and temporal distributions of organic and inorganic
phosphorus in sedimentary columns from Al-Kabir Al-Shimaliand Al-Hussain estuaries,
during the period March 2013- February 2014.
Organic phosphorus concentrations ra
nged between (2.0 - 207.6) μg/gin sediments
from Al-Kabir Al-Shimali estuary, and from (1.7 –130.9) μg/gin sediments from
Al-Hussainestuary. Sediment content from inorganic phosphorus ranged between
(12.4 – 371.2)μg / g at sediments from Al-Kabir Al-Shimali estuary, and from
(2.0 - 242.6)μg /g at Al-Hussain estuary. Granular composition of sediments did not play
a significant role in the temporal and spatial distributions of organic and inorganic
phosphorus.
In general, organic and inorganic phosphorus concentrations decreased gradually
from winter to summer, and from surface layers of the sedimentary column towards the
deeper layers.
The ratiobetween inorganic and organic phosphorus increasedfrom river into marine
sediments. In addition, this ratio increased gradually as the sedimentdepthincreased, and
was high in winter and low in summer.
This study was carried out during the period 2011–2010 for 12 months. 110 species
of phytoplankton in Al-Kabir Al-Shamali River were identified including 4 species of
Euglenophyta, 15 species of Cyanophyta, 49 species of Chrysophyta, 40 species of
Chlorophyta and 2 species of Pyrrophyta.
Some physicochemical parameters of water were determined. Some of them were the
temperature which ranged between 10.8–28°C, the pH 7.76–8.2 and the BOD 1.6–10mg/l,
while the concentrations of NO3
- ranged between 1.10-250 mg/l, nitrate 0.13-0.01mg/l, and
PO4
- ions 0.015–1.05 mg/l. The highest value of ammonium ions was 6.25mg/l and the
lowest was 0.011 mg/l. BOD concentrations ranged between 6.06-12.07mg/l.
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